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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Mertens%2C+S&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Mertens%2C+S&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Mertens%2C+S&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.13895">arXiv:2410.13895</a> <span> [<a href="https://arxiv.org/pdf/2410.13895">pdf</a>, <a href="https://arxiv.org/format/2410.13895">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> First constraints on general neutrino interactions based on KATRIN data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Beisenk%C3%B6tter%2C+J">J. Beisenk枚tter</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">M. Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondi%2C+Y">Y. Biondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Carminati%2C+M">M. Carminati</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatrabhuti%2C+A">A. Chatrabhuti</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+B+A">B. A. Daniel</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a>, <a href="/search/nucl-ex?searchtype=author&query=Engel%2C+R">R. Engel</a>, <a href="/search/nucl-ex?searchtype=author&query=Enomoto%2C+S">S. Enomoto</a> , et al. (108 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.13895v2-abstract-short" style="display: inline;"> The precision measurement of the tritium $尾$-decay spectrum performed by the KATRIN experiment provides a unique way to search for general neutrino interactions (GNI). All theoretical allowed GNI terms involving neutrinos are incorporated into a low-energy effective field theory, and can be identified by specific signatures in the measured tritium $尾$-spectrum. In this paper an effective descripti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.13895v2-abstract-full').style.display = 'inline'; document.getElementById('2410.13895v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.13895v2-abstract-full" style="display: none;"> The precision measurement of the tritium $尾$-decay spectrum performed by the KATRIN experiment provides a unique way to search for general neutrino interactions (GNI). All theoretical allowed GNI terms involving neutrinos are incorporated into a low-energy effective field theory, and can be identified by specific signatures in the measured tritium $尾$-spectrum. In this paper an effective description of the impact of GNI on the $尾$-spectrum is formulated and the first constraints on the effective GNI parameters are derived based on the 4 million electrons collected in the second measurement campaign of KATRIN in 2019. In addition, constraints on selected types of interactions are investigated, thereby exploring the potential of KATRIN to search for more specific new physics cases, including a right-handed W boson, a charged Higgs or leptoquarks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.13895v2-abstract-full').style.display = 'none'; document.getElementById('2410.13895v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.13516">arXiv:2406.13516</a> <span> [<a href="https://arxiv.org/pdf/2406.13516">pdf</a>, <a href="https://arxiv.org/format/2406.13516">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Direct neutrino-mass measurement based on 259 days of KATRIN data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Beisenk%C3%B6tter%2C+J">J. Beisenk枚tter</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">M. Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Biondi%2C+Y">Y. Biondi</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carminati%2C+M">M. Carminati</a>, <a href="/search/nucl-ex?searchtype=author&query=Chatrabhuti%2C+A">A. Chatrabhuti</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Daniel%2C+B+A">B. A. Daniel</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a> , et al. (124 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.13516v1-abstract-short" style="display: inline;"> The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass bears important relevance from particle physics to cosmology. In this work, we report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium $尾$-decay close to the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.13516v1-abstract-full').style.display = 'inline'; document.getElementById('2406.13516v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.13516v1-abstract-full" style="display: none;"> The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass bears important relevance from particle physics to cosmology. In this work, we report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium $尾$-decay close to the kinematic endpoint. Based on the first five neutrino-mass measurement campaigns, we derive a best-fit value of $m_谓^{2} = {-0.14^{+0.13}_{-0.15}}~\mathrm{eV^2}$, resulting in an upper limit of $m_谓< {0.45}~\mathrm{eV}$ at 90 % confidence level. With six times the statistics of previous data sets, amounting to 36 million electrons collected in 259 measurement days, a substantial reduction of the background level and improved systematic uncertainties, this result tightens KATRIN's previous bound by a factor of almost two. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.13516v1-abstract-full').style.display = 'none'; document.getElementById('2406.13516v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">61 pages, 20 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.10856">arXiv:2308.10856</a> <span> [<a href="https://arxiv.org/pdf/2308.10856">pdf</a>, <a href="https://arxiv.org/format/2308.10856">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Majorana Demonstrator Data Release for AI/ML Applications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhimani%2C+K+H">K. H. Bhimani</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y+-">Y. -D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Fuad%2C+N">N. Fuad</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.10856v3-abstract-short" style="display: inline;"> The enclosed data release consists of a subset of the calibration data from the Majorana Demonstrator experiment. Each Majorana event is accompanied by raw Germanium detector waveforms, pulse shape discrimination cuts, and calibrated final energies, all shared in an HDF5 file format along with relevant metadata. This release is specifically designed to support the training and testing of Artificia… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.10856v3-abstract-full').style.display = 'inline'; document.getElementById('2308.10856v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.10856v3-abstract-full" style="display: none;"> The enclosed data release consists of a subset of the calibration data from the Majorana Demonstrator experiment. Each Majorana event is accompanied by raw Germanium detector waveforms, pulse shape discrimination cuts, and calibrated final energies, all shared in an HDF5 file format along with relevant metadata. This release is specifically designed to support the training and testing of Artificial Intelligence (AI) and Machine Learning (ML) algorithms upon our data. This document is structured as follows. Section I provides an overview of the dataset's content and format; Section II outlines the location of this dataset and the method for accessing it; Section III presents the NPML Machine Learning Challenge associated with this dataset; Section IV contains a disclaimer from the Majorana collaboration regarding the use of this dataset; Appendix A contains technical details of this data release. Please direct questions about the material provided within this release to liaobo77@ucsd.edu (A. Li). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.10856v3-abstract-full').style.display = 'none'; document.getElementById('2308.10856v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">DataPlanet Access: https://dataplanet.ucsd.edu/dataset.xhtml?persistentId=perma:83.ucsddata/UQWQAV</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.11099">arXiv:2212.11099</a> <span> [<a href="https://arxiv.org/pdf/2212.11099">pdf</a>, <a href="https://arxiv.org/format/2212.11099">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Neutrinoless Double Beta Decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/nucl-ex?searchtype=author&query=Alfonso%2C+K">K. Alfonso</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreoiu%2C+C">C. Andreoiu</a>, <a href="/search/nucl-ex?searchtype=author&query=Angelico%2C+E">E. Angelico</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Asaadi%2C+J+A+A">J. A. A. Asaadi</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone</a>, <a href="/search/nucl-ex?searchtype=author&query=Axani%2C+S+N">S. N. Axani</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barbeau%2C+P+S">P. S. Barbeau</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellini%2C+F">F. Bellini</a>, <a href="/search/nucl-ex?searchtype=author&query=Beretta%2C+M">M. Beretta</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhatta%2C+T">T. Bhatta</a>, <a href="/search/nucl-ex?searchtype=author&query=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">M. Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Breur%2C+P+A">P. A. Breur</a>, <a href="/search/nucl-ex?searchtype=author&query=Brodsky%2C+J+P">J. P. Brodsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Brofferio%2C+C">C. Brofferio</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+E">E. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunner%2C+T">T. Brunner</a>, <a href="/search/nucl-ex?searchtype=author&query=Burlac%2C+N">N. Burlac</a>, <a href="/search/nucl-ex?searchtype=author&query=Caden%2C+E">E. Caden</a> , et al. (207 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.11099v1-abstract-short" style="display: inline;"> This White Paper, prepared for the Fundamental Symmetries, Neutrons, and Neutrinos Town Meeting related to the 2023 Nuclear Physics Long Range Plan, makes the case for double beta decay as a critical component of the future nuclear physics program. The major experimental collaborations and many theorists have endorsed this white paper. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.11099v1-abstract-full" style="display: none;"> This White Paper, prepared for the Fundamental Symmetries, Neutrons, and Neutrinos Town Meeting related to the 2023 Nuclear Physics Long Range Plan, makes the case for double beta decay as a critical component of the future nuclear physics program. The major experimental collaborations and many theorists have endorsed this white paper. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.11099v1-abstract-full').style.display = 'none'; document.getElementById('2212.11099v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">white paper submitted for the Fundamental Symmetries, Neutrons, and Neutrinos Town Meeting in support of the US Nuclear Physics Long Range Planning Process</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.07638">arXiv:2207.07638</a> <span> [<a href="https://arxiv.org/pdf/2207.07638">pdf</a>, <a href="https://arxiv.org/format/2207.07638">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.062501">10.1103/PhysRevLett.130.062501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-$尾$ Decay in $^{76}$Ge </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhimani%2C+K+H">K. H. Bhimani</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.07638v2-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR searched for neutrinoless double-$尾$ decay ($0谓尾尾$) of $^{76}$Ge using modular arrays of high-purity Ge detectors operated in vacuum cryostats in a low-background shield. The arrays operated with up to 40.4 kg of detectors (27.2 kg enriched to $\sim$88\% in $^{76}$Ge). From these measurements, the DEMONSTRATOR has accumulated 64.5 kg yr of enriched active exposure. With a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.07638v2-abstract-full').style.display = 'inline'; document.getElementById('2207.07638v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.07638v2-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR searched for neutrinoless double-$尾$ decay ($0谓尾尾$) of $^{76}$Ge using modular arrays of high-purity Ge detectors operated in vacuum cryostats in a low-background shield. The arrays operated with up to 40.4 kg of detectors (27.2 kg enriched to $\sim$88\% in $^{76}$Ge). From these measurements, the DEMONSTRATOR has accumulated 64.5 kg yr of enriched active exposure. With a world-leading energy resolution of 2.52 keV FWHM at the 2039 keV $Q_{尾尾}$ (0.12\%), we set a half-life limit of $0谓尾尾$ in $^{76}$Ge at $T_{1/2}>8.3\times10^{25}$ yr (90\% C.L.). This provides a range of upper limits on $m_{尾尾}$ of $(113-269)$ meV (90\% C.L.), depending on the choice of nuclear matrix elements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.07638v2-abstract-full').style.display = 'none'; document.getElementById('2207.07638v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 130, 062501 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.06337">arXiv:2207.06337</a> <span> [<a href="https://arxiv.org/pdf/2207.06337">pdf</a>, <a href="https://arxiv.org/format/2207.06337">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Search for keV-scale Sterile Neutrinos with first KATRIN Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a> , et al. (106 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.06337v1-abstract-short" style="display: inline;"> In this work we present a keV-scale sterile-neutrino search with the first tritium data of the KATRIN experiment, acquired in the commissioning run in 2018. KATRIN performs a spectroscopic measurement of the tritium $尾$-decay spectrum with the main goal of directly determining the effective electron anti-neutrino mass. During this commissioning phase a lower tritium activity facilitated the search… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06337v1-abstract-full').style.display = 'inline'; document.getElementById('2207.06337v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.06337v1-abstract-full" style="display: none;"> In this work we present a keV-scale sterile-neutrino search with the first tritium data of the KATRIN experiment, acquired in the commissioning run in 2018. KATRIN performs a spectroscopic measurement of the tritium $尾$-decay spectrum with the main goal of directly determining the effective electron anti-neutrino mass. During this commissioning phase a lower tritium activity facilitated the search for sterile neutrinos with a mass of up to $1.6\, \mathrm{keV}$. We do not find a signal and set an exclusion limit on the sterile-to-active mixing amplitude of down to $\sin^2胃< 5\cdot10^{-4}$ ($95\,\%$ C.L.), improving current laboratory-based bounds in the sterile-neutrino mass range between 0.1 and $1.0\, \mathrm{keV}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06337v1-abstract-full').style.display = 'none'; document.getElementById('2207.06337v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.06326">arXiv:2207.06326</a> <span> [<a href="https://arxiv.org/pdf/2207.06326">pdf</a>, <a href="https://arxiv.org/format/2207.06326">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.107.082005">10.1103/PhysRevD.107.082005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Lorentz-Invariance Violation with the first KATRIN data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a> , et al. (108 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.06326v1-abstract-short" style="display: inline;"> Some extensions of the Standard Model of Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06326v1-abstract-full').style.display = 'inline'; document.getElementById('2207.06326v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.06326v1-abstract-full" style="display: none;"> Some extensions of the Standard Model of Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters $(a_{\text{of}}^{(3)})_{00}$, $(a_{\text{of}}^{(3)})_{10}$ and $(a_{\text{of}}^{(3)})_{11}$ which would manifest themselves in a non-isotropic beta-decaying source as a sidereal oscillation and an overall shift of the spectral endpoint. Based on the data of the first scientific run of the KATRIN experiment, we set the first limit on $\left|(a_{\text{of}}^{(3)})_{11}\right|$ of $< 3.7\cdot10^{-6}$ GeV at 90\% confidence level. Moreover, we derive new constraints on $(a_{\text{of}}^{(3)})_{00}$ and $(a_{\text{of}}^{(3)})_{10}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.06326v1-abstract-full').style.display = 'none'; document.getElementById('2207.06326v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.08059">arXiv:2203.08059</a> <span> [<a href="https://arxiv.org/pdf/2203.08059">pdf</a>, <a href="https://arxiv.org/format/2203.08059">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6471/ac834e">10.1088/1361-6471/ac834e <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> KATRIN: Status and Prospects for the Neutrino Mass and Beyond </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Balzer%2C+M">M. Balzer</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">M. Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bombelli%2C+L">L. Bombelli</a>, <a href="/search/nucl-ex?searchtype=author&query=Bormann%2C+D">D. Bormann</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brofferio%2C+C">C. Brofferio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bruch%2C+C">C. Bruch</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carminati%2C+M">M. Carminati</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Cremonesi%2C+O">O. Cremonesi</a> , et al. (137 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.08059v3-abstract-short" style="display: inline;"> The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 beta decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a su… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08059v3-abstract-full').style.display = 'inline'; document.getElementById('2203.08059v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.08059v3-abstract-full" style="display: none;"> The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 beta decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a sub-eV sensitivity. After 1000 days of data-taking, KATRIN's design sensitivity is 0.2 eV at the 90% confidence level. In this white paper we describe the current status of KATRIN; explore prospects for measuring the neutrino mass and other physics observables, including sterile neutrinos and other beyond-Standard-Model hypotheses; and discuss research-and-development projects that may further improve the KATRIN sensitivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08059v3-abstract-full').style.display = 'none'; document.getElementById('2203.08059v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contribution to Snowmass 2021. 70 pages excluding references; 35 figures. Author list updated June 2023</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. G: Nucl. Part. Phys. 49 (2022) 100501 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.04587">arXiv:2202.04587</a> <span> [<a href="https://arxiv.org/pdf/2202.04587">pdf</a>, <a href="https://arxiv.org/format/2202.04587">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.129.011806">10.1103/PhysRevLett.129.011806 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Batzler%2C+D">D. Batzler</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a> , et al. (107 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2202.04587v1-abstract-short" style="display: inline;"> We report on the direct cosmic relic neutrino background search from the first two science runs of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the kinematic endpoint at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity of 9.7e10 (1.1e11) at a 90% (95%) confidence l… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.04587v1-abstract-full').style.display = 'inline'; document.getElementById('2202.04587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.04587v1-abstract-full" style="display: none;"> We report on the direct cosmic relic neutrino background search from the first two science runs of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the kinematic endpoint at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity of 9.7e10 (1.1e11) at a 90% (95%) confidence level. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint accounting for relic neutrino captures in the Tritium source reveals no significant overdensity. This work improves the results obtained by the previous kinematic neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to <1e10 at 90% confidence level, by relying on updated operational conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.04587v1-abstract-full').style.display = 'none'; document.getElementById('2202.04587v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.09351">arXiv:2111.09351</a> <span> [<a href="https://arxiv.org/pdf/2111.09351">pdf</a>, <a href="https://arxiv.org/format/2111.09351">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/17/05/T05003">10.1088/1748-0221/17/05/T05003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The MAJORANA DEMONSTRATOR Readout Electronics System </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Amman%2C+M">M. Amman</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhimani%2C+K+H">K. H. Bhimani</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Burritt%2C+T+H">T. H. Burritt</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cooper%2C+R+J">R. J. Cooper</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Drobizhev%2C+A">A. Drobizhev</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwins%2C+D+W">D. W. Edwins</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a> , et al. (54 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.09351v2-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR comprises two arrays of high-purity germanium detectors constructed to search for neutrinoless double-beta decay in 76-Ge and other physics beyond the Standard Model. Its readout electronics were designed to have low electronic noise, and radioactive backgrounds were minimized by using low-mass components and low-radioactivity materials near the detectors. This paper prov… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.09351v2-abstract-full').style.display = 'inline'; document.getElementById('2111.09351v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.09351v2-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR comprises two arrays of high-purity germanium detectors constructed to search for neutrinoless double-beta decay in 76-Ge and other physics beyond the Standard Model. Its readout electronics were designed to have low electronic noise, and radioactive backgrounds were minimized by using low-mass components and low-radioactivity materials near the detectors. This paper provides a description of all components of the MAJORANA DEMONSTRATOR readout electronics, spanning the front-end electronics and internal cabling, back-end electronics, digitizer, and power supplies, along with the grounding scheme. The spectroscopic performance achieved with these readout electronics is also demonstrated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.09351v2-abstract-full').style.display = 'none'; document.getElementById('2111.09351v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">For submission to JINST, 17 figures. v2: revised version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.14796">arXiv:2110.14796</a> <span> [<a href="https://arxiv.org/pdf/2110.14796">pdf</a>, <a href="https://arxiv.org/format/2110.14796">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.105.014617">10.1103/PhysRevC.105.014617 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Signatures of muonic activation in the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwards%2C+T+R">T. R. Edwards</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a> , et al. (33 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.14796v1-abstract-short" style="display: inline;"> Experiments searching for very rare processes such as neutrinoless double-beta decay require a detailed understanding of all sources of background. Signals from radioactive impurities present in construction and detector materials can be suppressed using a number of well-understood techniques. Background from in-situ cosmogenic interactions can be reduced by siting an experiment deep underground.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14796v1-abstract-full').style.display = 'inline'; document.getElementById('2110.14796v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.14796v1-abstract-full" style="display: none;"> Experiments searching for very rare processes such as neutrinoless double-beta decay require a detailed understanding of all sources of background. Signals from radioactive impurities present in construction and detector materials can be suppressed using a number of well-understood techniques. Background from in-situ cosmogenic interactions can be reduced by siting an experiment deep underground. However, the next generation of such experiments have unprecedented sensitivity goals of 10$^{28}$ years half-life with background rates of 10$^{-5}$cts/(keV kg yr) in the region of interest. To achieve these goals, the remaining cosmogenic background must be well understood. In the work presented here, Majorana Demonstrator data is used to search for decay signatures of meta-stable germanium isotopes. Contributions to the region of interest in energy and time are estimated using simulations, and compared to Demonstrator data. Correlated time-delayed signals are used to identify decay signatures of isotopes produced in the germanium detectors. A good agreement between expected and measured rate is found and different simulation frameworks are used to estimate the uncertainties of the predictions. The simulation campaign is then extended to characterize the background for the LEGEND experiment, a proposed tonne-scale effort searching for neutrinoless double-beta decay in $^{76}$Ge. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14796v1-abstract-full').style.display = 'none'; document.getElementById('2110.14796v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 12 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.11462">arXiv:2107.11462</a> <span> [<a href="https://arxiv.org/pdf/2107.11462">pdf</a>, <a href="https://arxiv.org/format/2107.11462">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> LEGEND-1000 Preconceptual Design Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=LEGEND+Collaboration"> LEGEND Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Abt%2C+I">I. Abt</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreoiu%2C+C">C. Andreoiu</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G+R">G. R. Araujo</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Bae%2C+W">W. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A">A. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantel%2C+M">M. Bantel</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barbeau%2C+P+S">P. S. Barbeau</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernieri%2C+E">E. Bernieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhimani%2C+K+H">K. H. Bhimani</a>, <a href="/search/nucl-ex?searchtype=author&query=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bolozdynya%2C+A">A. Bolozdynya</a> , et al. (239 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.11462v1-abstract-short" style="display: inline;"> We propose the construction of LEGEND-1000, the ton-scale Large Enriched Germanium Experiment for Neutrinoless $尾尾$ Decay. This international experiment is designed to answer one of the highest priority questions in fundamental physics. It consists of 1000 kg of Ge detectors enriched to more than 90% in the $^{76}$Ge isotope operated in a liquid argon active shield at a deep underground laboratory… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.11462v1-abstract-full').style.display = 'inline'; document.getElementById('2107.11462v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.11462v1-abstract-full" style="display: none;"> We propose the construction of LEGEND-1000, the ton-scale Large Enriched Germanium Experiment for Neutrinoless $尾尾$ Decay. This international experiment is designed to answer one of the highest priority questions in fundamental physics. It consists of 1000 kg of Ge detectors enriched to more than 90% in the $^{76}$Ge isotope operated in a liquid argon active shield at a deep underground laboratory. By combining the lowest background levels with the best energy resolution in the field, LEGEND-1000 will perform a quasi-background-free search and can make an unambiguous discovery of neutrinoless double-beta decay with just a handful of counts at the decay $Q$ value. The experiment is designed to probe this decay with a 99.7%-CL discovery sensitivity in the $^{76}$Ge half-life of $1.3\times10^{28}$ years, corresponding to an effective Majorana mass upper limit in the range of 9-21 meV, to cover the inverted-ordering neutrino mass scale with 10 yr of live time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.11462v1-abstract-full').style.display = 'none'; document.getElementById('2107.11462v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.08533">arXiv:2105.08533</a> <span> [<a href="https://arxiv.org/pdf/2105.08533">pdf</a>, <a href="https://arxiv.org/format/2105.08533">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> First direct neutrino-mass measurement with sub-eV sensitivity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Carney%2C+R+M+D">R. M. D. Carney</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a> , et al. (103 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2105.08533v1-abstract-short" style="display: inline;"> We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, $m_谓$, via a high-precision measurement of the tritium $尾$-decay spectrum close to its endpoint at $18.6\,\mathrm{keV}$. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the backgro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.08533v1-abstract-full').style.display = 'inline'; document.getElementById('2105.08533v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.08533v1-abstract-full" style="display: none;"> We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, $m_谓$, via a high-precision measurement of the tritium $尾$-decay spectrum close to its endpoint at $18.6\,\mathrm{keV}$. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by $25\,\%$ with respect to the first campaign. A sensitivity on $m_谓$ of $0.7\,\mathrm{eV/c^2}$ at $90\,\%$ confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields $m_谓^2 = (0.26\pm0.34)\,\mathrm{eV^4/c^4}$, resulting in an upper limit of $m_谓<0.9\,\mathrm{eV/c^2}$ ($90\,\%$ CL). By combining this result with the first neutrino mass campaign, we find an upper limit of $m_谓<0.8\,\mathrm{eV/c^2}$ ($90\,\%$ CL). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.08533v1-abstract-full').style.display = 'none'; document.getElementById('2105.08533v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 10 figures, 5 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.05253">arXiv:2101.05253</a> <span> [<a href="https://arxiv.org/pdf/2101.05253">pdf</a>, <a href="https://arxiv.org/format/2101.05253">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.012005">10.1103/PhysRevD.104.012005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analysis methods for the first KATRIN neutrino-mass measurement </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6ttcher%2C+M">M. B枚ttcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a> , et al. (104 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.05253v3-abstract-short" style="display: inline;"> We report on the data set, data handling, and detailed analysis techniques of the first neutrino-mass measurement by the Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes the absolute neutrino-mass scale via the $尾$-decay kinematics of molecular tritium. The source is highly pure, cryogenic T$_2$ gas. The $尾$ electrons are guided along magnetic field lines toward a high-resolution, inte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.05253v3-abstract-full').style.display = 'inline'; document.getElementById('2101.05253v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.05253v3-abstract-full" style="display: none;"> We report on the data set, data handling, and detailed analysis techniques of the first neutrino-mass measurement by the Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes the absolute neutrino-mass scale via the $尾$-decay kinematics of molecular tritium. The source is highly pure, cryogenic T$_2$ gas. The $尾$ electrons are guided along magnetic field lines toward a high-resolution, integrating spectrometer for energy analysis. A silicon detector counts $尾$ electrons above the energy threshold of the spectrometer, so that a scan of the thresholds produces a precise measurement of the high-energy spectral tail. After detailed theoretical studies, simulations, and commissioning measurements, extending from the molecular final-state distribution to inelastic scattering in the source to subtleties of the electromagnetic fields, our independent, blind analyses allow us to set an upper limit of 1.1 eV on the neutrino-mass scale at a 90\% confidence level. This first result, based on a few weeks of running at a reduced source intensity and dominated by statistical uncertainty, improves on prior limits by nearly a factor of two. This result establishes an analysis framework for future KATRIN measurements, and provides important input to both particle theory and cosmology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.05253v3-abstract-full').style.display = 'none'; document.getElementById('2101.05253v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">36 pages with 26 figures. Accepted to Phys. Rev. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 012005 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.05087">arXiv:2011.05087</a> <span> [<a href="https://arxiv.org/pdf/2011.05087">pdf</a>, <a href="https://arxiv.org/format/2011.05087">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.126.091803">10.1103/PhysRevLett.126.091803 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenmueller%2C+K">K. Altenmueller</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bieringer%2C+B">B. Bieringer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Boettcher%2C+M">M. Boettcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. Diaz Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a> , et al. (104 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.05087v1-abstract-short" style="display: inline;"> We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.05087v1-abstract-full').style.display = 'inline'; document.getElementById('2011.05087v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.05087v1-abstract-full" style="display: none;"> We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sensitive to a fourth mass state $m^2_{4} \lesssim$ 1000 eV$^2$ and to active-to-sterile neutrino mixing down to $|U_{e4}|^2 \gtrsim 2\cdot10^{-2}$. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound for $m^2_{4} <$ 30 eV$^2$. The reactor and gallium anomalies are constrained for $ 100 < 螖{m}^2_{41} < 1000$ eV$^2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.05087v1-abstract-full').style.display = 'none'; document.getElementById('2011.05087v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 091803 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.06014">arXiv:2008.06014</a> <span> [<a href="https://arxiv.org/pdf/2008.06014">pdf</a>, <a href="https://arxiv.org/format/2008.06014">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.103.015501">10.1103/PhysRevC.103.015501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Majorana Demonstrator's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Drobizhev%2C+A">A. Drobizhev</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwards%2C+T+R">T. R. Edwards</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwins%2C+D+W">D. W. Edwins</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (38 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2008.06014v4-abstract-short" style="display: inline;"> The Majorana Demonstrator is a neutrinoless double-beta decay search consisting of a low-background modular array of high-purity germanium detectors, $\sim2/3$ of which are enriched to 88\% in $^{76}$Ge. The experiment is also searching for double-beta decay of $^{76}$Ge to excited states (e.s.) in $^{76}$Se. $^{76}$Ge can decay into three daughter states of $^{76}$Se, with clear event signatures… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.06014v4-abstract-full').style.display = 'inline'; document.getElementById('2008.06014v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.06014v4-abstract-full" style="display: none;"> The Majorana Demonstrator is a neutrinoless double-beta decay search consisting of a low-background modular array of high-purity germanium detectors, $\sim2/3$ of which are enriched to 88\% in $^{76}$Ge. The experiment is also searching for double-beta decay of $^{76}$Ge to excited states (e.s.) in $^{76}$Se. $^{76}$Ge can decay into three daughter states of $^{76}$Se, with clear event signatures consisting of a $尾尾$-decay followed by the prompt emission of one or two $纬$-rays. This results with high probability in multi-detector coincidences. The granularity of the Demonstrator detector array enables powerful discrimination of this event signature from backgrounds. Using 41.9~kg-y of isotopic exposure, the Demonstrator has set world leading limits for each e.s.\ decay of $^{76}$Ge, with 90\% CL lower half-life limits in the range of $(0.75-4.0)\times10^{24}$~y. In particular, for the $2谓$ transition to the first $0^+$ e.s.\ of $^{76}$Se, a lower half-life limit of $7.5\times10^{23}$~y at 90\% CL was achieved. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.06014v4-abstract-full').style.display = 'none'; document.getElementById('2008.06014v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 103, 015501 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.13851">arXiv:2006.13851</a> <span> [<a href="https://arxiv.org/pdf/2006.13851">pdf</a>, <a href="https://arxiv.org/ps/2006.13851">ps</a>, <a href="https://arxiv.org/format/2006.13851">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2020.164474">10.1016/j.nima.2020.164474 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of a Silicon Drift Detector for High-Resolution Electron Spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Gugiatti%2C+M">Matteo Gugiatti</a>, <a href="/search/nucl-ex?searchtype=author&query=Biassoni%2C+M">Matteo Biassoni</a>, <a href="/search/nucl-ex?searchtype=author&query=Carminati%2C+M">Marco Carminati</a>, <a href="/search/nucl-ex?searchtype=author&query=Cremonesi%2C+O">Oliviero Cremonesi</a>, <a href="/search/nucl-ex?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/nucl-ex?searchtype=author&query=King%2C+P">Pietro King</a>, <a href="/search/nucl-ex?searchtype=author&query=Lechner%2C+P">Peter Lechner</a>, <a href="/search/nucl-ex?searchtype=author&query=Mertens%2C+S">Susanne Mertens</a>, <a href="/search/nucl-ex?searchtype=author&query=Pagnanini%2C+L">Lorenzo Pagnanini</a>, <a href="/search/nucl-ex?searchtype=author&query=Pavan%2C+M">Maura Pavan</a>, <a href="/search/nucl-ex?searchtype=author&query=Pozzi%2C+S">Stefano Pozzi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.13851v2-abstract-short" style="display: inline;"> Silicon Drift Detectors, widely employed in high-resolution and high-rate X-ray applications, are considered here with interest also for electron detection. The accurate measurement of the tritium beta decay is the core of the TRISTAN (TRitium Investigation on STerile to Active Neutrino mixing) project. This work presents the characterization of a single-pixel SDD detector with a mono-energetic el… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.13851v2-abstract-full').style.display = 'inline'; document.getElementById('2006.13851v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.13851v2-abstract-full" style="display: none;"> Silicon Drift Detectors, widely employed in high-resolution and high-rate X-ray applications, are considered here with interest also for electron detection. The accurate measurement of the tritium beta decay is the core of the TRISTAN (TRitium Investigation on STerile to Active Neutrino mixing) project. This work presents the characterization of a single-pixel SDD detector with a mono-energetic electron beam obtained from a Scanning Electron Microscope. The suitability of the SDD to detect electrons, in the energy range spanning from few keV to tens of keV, is demonstrated. Experimental measurements reveal a strong effect of the detector's entrance window structure on the observed energy response. A detailed detector model is therefore necessary to reconstruct the spectrum of an unknown beta-decay source. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.13851v2-abstract-full').style.display = 'none'; document.getElementById('2006.13851v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.13179">arXiv:2006.13179</a> <span> [<a href="https://arxiv.org/pdf/2006.13179">pdf</a>, <a href="https://arxiv.org/format/2006.13179">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-022-10161-y">10.1140/epjc/s10052-022-10161-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $伪$-event Characterization and Rejection in Point-Contact HPGe Detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=The+MAJORANA+Collaboration"> The MAJORANA Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Drobizhev%2C+A">A. Drobizhev</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwards%2C+T+R">T. R. Edwards</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwins%2C+D+W">D. W. Edwins</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (40 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.13179v3-abstract-short" style="display: inline;"> P-type point contact (PPC) HPGe detectors are a leading technology for rare event searches due to their excellent energy resolution, low thresholds, and multi-site event rejection capabilities. We have characterized a PPC detector's response to $伪$ particles incident on the sensitive passivated and p+ surfaces, a previously poorly-understood source of background. The detector studied is identical… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.13179v3-abstract-full').style.display = 'inline'; document.getElementById('2006.13179v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.13179v3-abstract-full" style="display: none;"> P-type point contact (PPC) HPGe detectors are a leading technology for rare event searches due to their excellent energy resolution, low thresholds, and multi-site event rejection capabilities. We have characterized a PPC detector's response to $伪$ particles incident on the sensitive passivated and p+ surfaces, a previously poorly-understood source of background. The detector studied is identical to those in the MAJORANA DEMONSTRATOR experiment, a search for neutrinoless double-beta decay ($0谓尾尾$) in $^{76}$Ge. $伪$ decays on most of the passivated surface exhibit significant energy loss due to charge trapping, with waveforms exhibiting a delayed charge recovery (DCR) signature caused by the slow collection of a fraction of the trapped charge. The DCR is found to be complementary to existing methods of $伪$ identification, reliably identifying $伪$ background events on the passivated surface of the detector. We demonstrate effective rejection of all surface $伪$ events (to within statistical uncertainty) with a loss of only 0.2% of bulk events by combining the DCR discriminator with previously-used methods. The DCR discriminator has been used to reduce the background rate in the $0谓尾尾$ region of interest window by an order of magnitude in the MAJORANA DEMONSTRATOR, and will be used in the upcoming LEGEND-200 experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.13179v3-abstract-full').style.display = 'none'; document.getElementById('2006.13179v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication in European Journal of Physics C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.04128">arXiv:2003.04128</a> <span> [<a href="https://arxiv.org/pdf/2003.04128">pdf</a>, <a href="https://arxiv.org/format/2003.04128">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TNS.2020.3043671">10.1109/TNS.2020.3043671 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> ADC Nonlinearity Correction for the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Allmond%2C+J+M">J. M. Allmond</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Campbell%2C+C+M">C. M. Campbell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Crawford%2C+H+L">H. L. Crawford</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Drobizhev%2C+A">A. Drobizhev</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwins%2C+D+W">D. W. Edwins</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2003.04128v4-abstract-short" style="display: inline;"> Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the Majorana Demonstrator 76Ge neutrinoless double beta decay search. Enabling the experiment's high-resolution spectral analysis and efficient pulse shape discrimination required careful measurement and correction of ADC… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.04128v4-abstract-full').style.display = 'inline'; document.getElementById('2003.04128v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.04128v4-abstract-full" style="display: none;"> Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the Majorana Demonstrator 76Ge neutrinoless double beta decay search. Enabling the experiment's high-resolution spectral analysis and efficient pulse shape discrimination required careful measurement and correction of ADC nonlinearites. A simple measurement protocol was developed that did not require sophisticated equipment or lengthy data taking campaigns. A slope-dependent hysteresis was observed and characterized. A correction applied to digitized waveforms prior to signal processing reduced the differential and integral nonlinearites by an order of magnitude, eliminating these as dominant contributions to the systematic energy uncertainty at the double-beta decay Q value. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.04128v4-abstract-full').style.display = 'none'; document.getElementById('2003.04128v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LA-UR-20-21663 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Transactions on Nuclear Science, vol. 68, no. 3, pp. 359-367, March 2021 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.06181">arXiv:1912.06181</a> <span> [<a href="https://arxiv.org/pdf/1912.06181">pdf</a>, <a href="https://arxiv.org/format/1912.06181">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/1468/1/012040">10.1088/1742-6596/1468/1/012040 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Low Energy Rare Event Search with the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=MAJORANA+Collaboration"> MAJORANA Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Wiseman%2C+C">C. Wiseman</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Drobizhev%2C+A">A. Drobizhev</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwins%2C+D+W">D. W. Edwins</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (37 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1912.06181v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is sensitive to rare events near its energy threshold, including bosonic dark matter, solar axions, and lightly ionizing particles. In this analysis, a novel training set of low energy small-angle Compton scatter events is used to determine the efficiency of pulse shape analysis cuts, and we present updated bosonic dark matter and solar axion results from an 11.17 kg-y da… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.06181v1-abstract-full').style.display = 'inline'; document.getElementById('1912.06181v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.06181v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is sensitive to rare events near its energy threshold, including bosonic dark matter, solar axions, and lightly ionizing particles. In this analysis, a novel training set of low energy small-angle Compton scatter events is used to determine the efficiency of pulse shape analysis cuts, and we present updated bosonic dark matter and solar axion results from an 11.17 kg-y dataset using a 5 keV analysis threshold. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.06181v1-abstract-full').style.display = 'none'; document.getElementById('1912.06181v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures. Proceedings of the 16th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2019), September 9-13, 2019, Toyama, Japan</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.05761">arXiv:1912.05761</a> <span> [<a href="https://arxiv.org/pdf/1912.05761">pdf</a>, <a href="https://arxiv.org/format/1912.05761">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/1468/1/012115">10.1088/1742-6596/1468/1/012115 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P">P-H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+M+L">M. L. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Drobizhev%2C+A">A. Drobizhev</a>, <a href="/search/nucl-ex?searchtype=author&query=Edwins%2C+D+W">D. W. Edwins</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1912.05761v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is searching for double-beta decay of $^{76}$Ge to excited states (E.S.) in $^{76}$Se using a modular array of high purity Germanium detectors. $^{76}$Ge can decay into three E.S.s of $^{76}$Se. The E.S. decays have a clear event signature consisting of a $尾尾$-decay with the prompt emission of one or two $纬$-rays, resulting in with high probability in a multi-site event.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.05761v1-abstract-full').style.display = 'inline'; document.getElementById('1912.05761v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.05761v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is searching for double-beta decay of $^{76}$Ge to excited states (E.S.) in $^{76}$Se using a modular array of high purity Germanium detectors. $^{76}$Ge can decay into three E.S.s of $^{76}$Se. The E.S. decays have a clear event signature consisting of a $尾尾$-decay with the prompt emission of one or two $纬$-rays, resulting in with high probability in a multi-site event. The granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 21.3 kg-y of isotopic exposure, the DEMONSTRATOR has set world leading limits for each E.S. decay, with 90% CL lower half-life limits in the range of $(0.56-2.1)\cdot10^{24}$ y. In particular, for the $2谓$ transition to the first $0^+$ E.S. of $^{76}$Se, a lower half-life limit of $0.68\cdot10^{24}$ at 90% CL was achieved. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.05761v1-abstract-full').style.display = 'none'; document.getElementById('1912.05761v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.06069">arXiv:1909.06069</a> <span> [<a href="https://arxiv.org/pdf/1909.06069">pdf</a>, <a href="https://arxiv.org/format/1909.06069">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-020-7718-z">10.1140/epjc/s10052-020-7718-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First operation of the KATRIN experiment with tritium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrett%2C+J">J. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bouquet%2C+H">H. Bouquet</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Debowski%2C+K">K. Debowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Descher%2C+M">M. Descher</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrero%2C+D+D">D. D铆az Barrero</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a> , et al. (146 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.06069v1-abstract-short" style="display: inline;"> The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of beta-decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06069v1-abstract-full').style.display = 'inline'; document.getElementById('1909.06069v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.06069v1-abstract-full" style="display: none;"> The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of beta-decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.2 eV 90% CL. In this work we report on the first operation of KATRIN with tritium which took place in 2018. During this commissioning phase of the tritium circulation system, excellent agreement of the theoretical prediction with the recorded spectra was found and stable conditions over a time period of 13 days could be established. These results are an essential prerequisite for the subsequent neutrino mass measurements with KATRIN in 2019. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06069v1-abstract-full').style.display = 'none'; document.getElementById('1909.06069v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.06048">arXiv:1909.06048</a> <span> [<a href="https://arxiv.org/pdf/1909.06048">pdf</a>, <a href="https://arxiv.org/format/1909.06048">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.123.221802">10.1103/PhysRevLett.123.221802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aker%2C+M">M. Aker</a>, <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Babutzka%2C+M">M. Babutzka</a>, <a href="/search/nucl-ex?searchtype=author&query=Barrett%2C+J">J. Barrett</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+S">S. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bokeloh%2C+K">K. Bokeloh</a>, <a href="/search/nucl-ex?searchtype=author&query=Bonn%2C+J">J. Bonn</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bouquet%2C+H">H. Bouquet</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=La+Cascio%2C+L">L. La Cascio</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W">W. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Corona%2C+T+J">T. J. Corona</a> , et al. (184 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.06048v1-abstract-short" style="display: inline;"> We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint at 18.57 keV gives an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06048v1-abstract-full').style.display = 'inline'; document.getElementById('1909.06048v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.06048v1-abstract-full" style="display: none;"> We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic endpoint at 18.57 keV gives an effective neutrino mass square value of $(-1.0^{+0.9}_{-1.1})$ eV$^2$. From this we derive an upper limit of 1.1 eV (90$\%$ confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of two and provides model-independent input to cosmological studies of structure formation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06048v1-abstract-full').style.display = 'none'; document.getElementById('1909.06048v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 221802 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1903.06452">arXiv:1903.06452</a> <span> [<a href="https://arxiv.org/pdf/1903.06452">pdf</a>, <a href="https://arxiv.org/format/1903.06452">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6471/ab8480">10.1088/1361-6471/ab8480 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-resolution spectroscopy of gaseous $^\mathrm{83m}$Kr conversion electrons with the KATRIN experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a> , et al. (102 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1903.06452v2-abstract-short" style="display: inline;"> In this work, we present the first spectroscopic measurements of conversion electrons originating from the decay of metastable gaseous $^\mathrm{83m}$Kr with the Karlsruhe Tritium Neutrino (KATRIN) experiment. The results obtained in this calibration measurement represent a major commissioning milestone for the upcoming direct neutrino mass measurement with KATRIN. The successful campaign demonstr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.06452v2-abstract-full').style.display = 'inline'; document.getElementById('1903.06452v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.06452v2-abstract-full" style="display: none;"> In this work, we present the first spectroscopic measurements of conversion electrons originating from the decay of metastable gaseous $^\mathrm{83m}$Kr with the Karlsruhe Tritium Neutrino (KATRIN) experiment. The results obtained in this calibration measurement represent a major commissioning milestone for the upcoming direct neutrino mass measurement with KATRIN. The successful campaign demonstrates the functionalities of the full KATRIN beamline. The KATRIN main spectrometer's excellent energy resolution of ~ 1 eV made it possible to determine the narrow K-32 and L$_3$-32 conversion electron line widths with an unprecedented precision of ~ 1 %. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.06452v2-abstract-full').style.display = 'none'; document.getElementById('1903.06452v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Fixed affiliation of the corresponding author</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.02299">arXiv:1902.02299</a> <span> [<a href="https://arxiv.org/pdf/1902.02299">pdf</a>, <a href="https://arxiv.org/format/1902.02299">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.100.025501">10.1103/PhysRevC.100.025501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Search for Neutrinoless Double-Beta Decay in $^{76}$Ge with 26 kg-yr of Exposure from the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Basu%2C+V">V. Basu</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1902.02299v1-abstract-short" style="display: inline;"> The MAJORANA Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of $^{76}$Ge. The MAJORANA DEMONSTRATOR consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in $^{76}$Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Fac… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.02299v1-abstract-full').style.display = 'inline'; document.getElementById('1902.02299v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.02299v1-abstract-full" style="display: none;"> The MAJORANA Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of $^{76}$Ge. The MAJORANA DEMONSTRATOR consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in $^{76}$Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-beta decay in $^{76}$Ge with $26.0\pm0.5$ kg-yr of enriched exposure. With the DEMONSTRATOR's unprecedented energy resolution of 2.53 keV FWHM at $Q_{尾尾}$, we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the $^{76}$Ge neutrinoless double-beta decay half-life of $2.7\times10^{25}$ yr (90% CL) with a median sensitivity of $4.8\times10^{25}$ yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the low-background configurations is $11.9\pm2.0$ counts/(FWHM t yr). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.02299v1-abstract-full').style.display = 'none'; document.getElementById('1902.02299v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 100, 025501 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.05388">arXiv:1901.05388</a> <span> [<a href="https://arxiv.org/pdf/1901.05388">pdf</a>, <a href="https://arxiv.org/format/1901.05388">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.99.065501">10.1103/PhysRevC.99.065501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multi-site event discrimination for the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a>, <a href="/search/nucl-ex?searchtype=author&query=Haufe%2C+C+R">C. R. Haufe</a>, <a href="/search/nucl-ex?searchtype=author&query=Hegedus%2C+R+J">R. J. Hegedus</a>, <a href="/search/nucl-ex?searchtype=author&query=Hehn%2C+L">L. Hehn</a> , et al. (38 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.05388v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the neutrinoless double-beta decay region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.05388v1-abstract-full').style.display = 'inline'; document.getElementById('1901.05388v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.05388v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the neutrinoless double-beta decay region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper. This cut is developed to remove events whose waveforms are typical of multi-site energy deposits while retaining (90 +/- 3.5)% of single-site events. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using 228Th calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and $0谓尾尾$ events, established using simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.05388v1-abstract-full').style.display = 'none'; document.getElementById('1901.05388v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 99, 065501 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.08139">arXiv:1812.08139</a> <span> [<a href="https://arxiv.org/pdf/1812.08139">pdf</a>, <a href="https://arxiv.org/ps/1812.08139">ps</a>, <a href="https://arxiv.org/format/1812.08139">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Recent results from the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Myslik%2C+J">J. Myslik</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.08139v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in $^{76}$Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, S… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.08139v1-abstract-full').style.display = 'inline'; document.getElementById('1812.08139v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.08139v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in $^{76}$Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale $^{76}$Ge experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.08139v1-abstract-full').style.display = 'none'; document.getElementById('1812.08139v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages. Proceedings of The 39th International Conference on High Energy Physics (ICHEP2018), 4-11 July, 2018, Seoul, Korea. Submitted to Proceedings of Science</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.01090">arXiv:1812.01090</a> <span> [<a href="https://arxiv.org/pdf/1812.01090">pdf</a>, <a href="https://arxiv.org/format/1812.01090">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.99.072004">10.1103/PhysRevD.99.072004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Tri-Nucleon Decay in the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a> , et al. (41 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.01090v2-abstract-short" style="display: inline;"> The Majorana Demonstrator is an ultra low-background experiment searching for neutrinoless double-beta decay in $^{76}$Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. We present the first limits for tri-nucleon decay-specific modes and invisible d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.01090v2-abstract-full').style.display = 'inline'; document.getElementById('1812.01090v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.01090v2-abstract-full" style="display: none;"> The Majorana Demonstrator is an ultra low-background experiment searching for neutrinoless double-beta decay in $^{76}$Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. We present the first limits for tri-nucleon decay-specific modes and invisible decay modes for Ge isotopes. We find a half-life limit of $4.9 \times 10^{25}$ yr for the decay $^{76}{\rm Ge(ppn)} \to {}^{73}{\rm Zn}\ e^+蟺^+$ and $4.7\times10^{25}$ yr for the decay $^{76}{\rm Ge(ppp)} \to ^{73}{\rm Cu}\ e^+蟺^+蟺^+$. The half-life limit for the invisible tri-proton decay mode of $^{76}$Ge was found to be $7.5\times10^{24}$ yr. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.01090v2-abstract-full').style.display = 'none'; document.getElementById('1812.01090v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Updated after suggested figure additions from referees</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 99, 072004 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.09168">arXiv:1808.09168</a> <span> [<a href="https://arxiv.org/pdf/1808.09168">pdf</a>, <a href="https://arxiv.org/format/1808.09168">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Impact of a cryogenic baffle system on the suppression of radon-induced background in the KATRIN Pre-Spectrometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Goerhardt%2C+S">S. Goerhardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bonn%2C+J">J. Bonn</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Fraenkle%2C+F+M">F. M. Fraenkle</a>, <a href="/search/nucl-ex?searchtype=author&query=Gumbsheimer%2C+R">R. Gumbsheimer</a>, <a href="/search/nucl-ex?searchtype=author&query=Mertens%2C+S">S. Mertens</a>, <a href="/search/nucl-ex?searchtype=author&query=Mueller%2C+F+R">F. R. Mueller</a>, <a href="/search/nucl-ex?searchtype=author&query=Thuemmler%2C+T">T. Thuemmler</a>, <a href="/search/nucl-ex?searchtype=author&query=Wandkowsky%2C+N">N. Wandkowsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinheimer%2C+C">C. Weinheimer</a>, <a href="/search/nucl-ex?searchtype=author&query=Wolf%2C+J">J. Wolf</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1808.09168v1-abstract-short" style="display: inline;"> The KATRIN experiment will determine the effective electron anti-neutrino mass with a sensitivity of 200 meV/c$^2$ at 90% CL. The energy analysis of tritium $尾$-decay electrons will be performed by a tandem setup of electrostatic retarding spectrometers which have to be operated at very low background levels of $<10^{-2}$ counts per second. This benchmark rate can be exceeded by background process… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.09168v1-abstract-full').style.display = 'inline'; document.getElementById('1808.09168v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.09168v1-abstract-full" style="display: none;"> The KATRIN experiment will determine the effective electron anti-neutrino mass with a sensitivity of 200 meV/c$^2$ at 90% CL. The energy analysis of tritium $尾$-decay electrons will be performed by a tandem setup of electrostatic retarding spectrometers which have to be operated at very low background levels of $<10^{-2}$ counts per second. This benchmark rate can be exceeded by background processes resulting from the emanation of single $^{219,220}$Rn atoms from the inner spectrometer surface and an array of non-evaporable getter strips used as main vacuum pump. Here we report on a the impact of a cryogenic technique to reduce this radon-induced background in electrostatic spectrometers. It is based on installing a liquid nitrogen cooled copper baffle in the spectrometer pump port to block the direct line of sight between the getter pump, which is the main source of $^{219}$Rn, and the sensitive flux tube volume. This cold surface traps a large fraction of emanated radon atoms in a region outside of the active flux tube, preventing background there. We outline important baffle design criteria to maximize the efficiency for the adsorption of radon atoms, describe the baffle implemented at the KATIRN Pre-Spectrometer test set-up, and report on its initial performance in suppressing radon-induced background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.09168v1-abstract-full').style.display = 'none'; document.getElementById('1808.09168v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 11 figures, submitted to JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.12173">arXiv:1805.12173</a> <span> [<a href="https://arxiv.org/pdf/1805.12173">pdf</a>, <a href="https://arxiv.org/format/1805.12173">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.astropartphys.2019.01.003">10.1016/j.astropartphys.2019.01.003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon-induced background in the KATRIN main spectrometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a> , et al. (109 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1805.12173v4-abstract-short" style="display: inline;"> The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to make a model-independent determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c$^{2}$. It investigates the kinematics of $尾$-particles from tritium $尾$-decay close to the endpoint of the energy spectrum. Because the KATRIN main spectrometer (MS) is located above ground, muon-induced backgrounds are of part… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.12173v4-abstract-full').style.display = 'inline'; document.getElementById('1805.12173v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.12173v4-abstract-full" style="display: none;"> The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to make a model-independent determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c$^{2}$. It investigates the kinematics of $尾$-particles from tritium $尾$-decay close to the endpoint of the energy spectrum. Because the KATRIN main spectrometer (MS) is located above ground, muon-induced backgrounds are of particular concern. Coincidence measurements with the MS and a scintillator-based muon detector system confirmed the model of secondary electron production by cosmic-ray muons inside the MS. Correlation measurements with the same setup showed that about $12\%$ of secondary electrons emitted from the inner surface are induced by cosmic-ray muons, with approximately one secondary electron produced for every 17 muon crossings. However, the magnetic and electrostatic shielding of the MS is able to efficiently suppress these electrons, and we find that muons are responsible for less than $17\%$ ($90\%$ confidence level) of the overall MS background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.12173v4-abstract-full').style.display = 'none'; document.getElementById('1805.12173v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.11220">arXiv:1803.11220</a> <span> [<a href="https://arxiv.org/pdf/1803.11220">pdf</a>, <a href="https://arxiv.org/format/1803.11220">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1051/epjconf/201817801006">10.1051/epjconf/201817801006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Majorana Demonstrator Status and Preliminary Results </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Yu%2C+C+-">C. -H. Yu</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y+-">Y. -D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M">M. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a> , et al. (41 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1803.11220v1-abstract-short" style="display: inline;"> The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide inform… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.11220v1-abstract-full').style.display = 'inline'; document.getElementById('1803.11220v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.11220v1-abstract-full" style="display: none;"> The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{尾尾}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.11220v1-abstract-full').style.display = 'none'; document.getElementById('1803.11220v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 2 figures. Proceeding for the "16th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS16)", 18-22 September 2017</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.04167">arXiv:1802.04167</a> <span> [<a href="https://arxiv.org/pdf/1802.04167">pdf</a>, <a href="https://arxiv.org/format/1802.04167">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/13/04/P04020">10.1088/1748-0221/13/04/P04020 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First transmission of electrons and ions through the KATRIN beamline </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/nucl-ex?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/nucl-ex?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/nucl-ex?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/nucl-ex?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/nucl-ex?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/nucl-ex?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/nucl-ex?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/nucl-ex?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/nucl-ex?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/nucl-ex?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/nucl-ex?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a>, <a href="/search/nucl-ex?searchtype=author&query=Engel%2C+R">R. Engel</a> , et al. (104 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.04167v2-abstract-short" style="display: inline;"> The Karlsruhe Tritium Neutrino (KATRIN) experiment is a large-scale effort to probe the absolute neutrino mass scale with a sensitivity of 0.2 eV (90% confidence level), via a precise measurement of the endpoint spectrum of tritium beta decay. This work documents several KATRIN commissioning milestones: the complete assembly of the experimental beamline, the successful transmission of electrons fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.04167v2-abstract-full').style.display = 'inline'; document.getElementById('1802.04167v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.04167v2-abstract-full" style="display: none;"> The Karlsruhe Tritium Neutrino (KATRIN) experiment is a large-scale effort to probe the absolute neutrino mass scale with a sensitivity of 0.2 eV (90% confidence level), via a precise measurement of the endpoint spectrum of tritium beta decay. This work documents several KATRIN commissioning milestones: the complete assembly of the experimental beamline, the successful transmission of electrons from three sources through the beamline to the primary detector, and tests of ion transport and retention. In the First Light commissioning campaign of Autumn 2016, photoelectrons were generated at the rear wall and ions were created by a dedicated ion source attached to the rear section; in July 2017, gaseous Kr-83m was injected into the KATRIN source section, and a condensed Kr-83m source was deployed in the transport section. In this paper we describe the technical details of the apparatus and the configuration for each measurement, and give first results on source and system performance. We have successfully achieved transmission from all four sources, established system stability, and characterized many aspects of the apparatus. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.04167v2-abstract-full').style.display = 'none'; document.getElementById('1802.04167v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Minor updates; as published in JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 13 P04020 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.11145">arXiv:1711.11145</a> <span> [<a href="https://arxiv.org/pdf/1711.11145">pdf</a>, <a href="https://arxiv.org/format/1711.11145">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Initial Results from the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a> , et al. (47 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.11145v1-abstract-short" style="display: inline;"> The MAJORANA Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The MAJORANA DEMONSTRATOR consists of 44 kg of high-purity Ge (HPGe) detectors (30 kg enriched in $^{76}$Ge) with a low-noise p-type point con… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.11145v1-abstract-full').style.display = 'inline'; document.getElementById('1711.11145v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.11145v1-abstract-full" style="display: none;"> The MAJORANA Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The MAJORANA DEMONSTRATOR consists of 44 kg of high-purity Ge (HPGe) detectors (30 kg enriched in $^{76}$Ge) with a low-noise p-type point contact (PPC) geometry. The detectors are split between two modules which are contained in a single lead and high-purity copper shield at the Sanford Underground Research Facility in Lead, South Dakota. Following a commissioning run that started in June 2015, the full detector array has been acquiring data since August 2016. We will discuss the status of the MAJORANA DEMONSTRATOR and initial results from the first physics run; including current background estimates, exotic low-energy physics searches, projections on the physics reach of the DEMONSTRATOR, and implications for a ton-scale Ge-based neutrinoless double-beta decay search. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.11145v1-abstract-full').style.display = 'none'; document.getElementById('1711.11145v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of TAUP 2017: XV International Conference on Topics in Astroparticle and Underground Physics (24-28 July 2017, Sudbury, ON, Canada)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.10361">arXiv:1711.10361</a> <span> [<a href="https://arxiv.org/pdf/1711.10361">pdf</a>, <a href="https://arxiv.org/format/1711.10361">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5019001">10.1063/1.5019001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Contamination Control and Assay Results for the Majorana Demonstrator Ultra Clean Components </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.10361v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The DEMONSTRATOR has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operatin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.10361v1-abstract-full').style.display = 'inline'; document.getElementById('1711.10361v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.10361v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The DEMONSTRATOR has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and process design. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.10361v1-abstract-full').style.display = 'none'; document.getElementById('1711.10361v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of Low Radioactivity Techniques (LRT May 2017, Seoul)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conference Proceedings 1921, 060005 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.03177">arXiv:1711.03177</a> <span> [<a href="https://arxiv.org/pdf/1711.03177">pdf</a>, <a href="https://arxiv.org/ps/1711.03177">ps</a>, <a href="https://arxiv.org/format/1711.03177">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Spectral analysis for the Majorana Demonstrator experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Hehn%2C+L">L. Hehn</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P">P-H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a> , et al. (46 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.03177v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}\textrm{Ge}$-enriched germanium detectors totaling 44.1 kg (29.7 kg enriched detectors), located at the 4850' level of the Sanf… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.03177v1-abstract-full').style.display = 'inline'; document.getElementById('1711.03177v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.03177v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}\textrm{Ge}$-enriched germanium detectors totaling 44.1 kg (29.7 kg enriched detectors), located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Data taken with this setup since summer 2015 at different construction stages of the experiment show a clear reduction of the observed background index around the ROI for $0谓尾尾$-decay search due to improvements in shielding. We discuss the statistical approaches to search for a $0谓尾尾$-signal and derive the physics sensitivity for an expected exposure of $10\,\textrm{kg}{\cdot}\textrm{y}$ from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.03177v1-abstract-full').style.display = 'none'; document.getElementById('1711.03177v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 page, 2 figures, to appear in Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics, 24 - 28 July 2017, Sudbury, ON, Canada</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.11608">arXiv:1710.11608</a> <span> [<a href="https://arxiv.org/pdf/1710.11608">pdf</a>, <a href="https://arxiv.org/format/1710.11608">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.120.132502">10.1103/PhysRevLett.120.132502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Zero-Neutrino Double Beta Decay in 76Ge with the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Aalseth%2C+C+E">C. E. Aalseth</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Aguayo%2C+E">E. Aguayo</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Amman%2C+M">M. Amman</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Back%2C+H+O">H. O. Back</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barbeau%2C+P+S">P. S. Barbeau</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/nucl-ex?searchtype=author&query=Boswell%2C+M">M. Boswell</a>, <a href="/search/nucl-ex?searchtype=author&query=Brodzinski%2C+R+L">R. L. Brodzinski</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A+S">A. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a> , et al. (104 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.11608v2-abstract-short" style="display: inline;"> The \MJ\ Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \MJ\ \DEM\ comprises 44.1~kg of Ge detectors (29.7 kg enriched in $^{76}$Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construct… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.11608v2-abstract-full').style.display = 'inline'; document.getElementById('1710.11608v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.11608v2-abstract-full" style="display: none;"> The \MJ\ Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \MJ\ \DEM\ comprises 44.1~kg of Ge detectors (29.7 kg enriched in $^{76}$Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at \qval\ and a very low background with no observed candidate events in 10 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of $1.9\times10^{25}$ yr (90\% CL). This result constrains the effective Majorana neutrino mass to below 240 to 520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is $4.0_{-2.5}^{+3.1}$ counts/(FWHM t yr). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.11608v2-abstract-full').style.display = 'none'; document.getElementById('1710.11608v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">typos fixed</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 120, 132502 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.01980">arXiv:1709.01980</a> <span> [<a href="https://arxiv.org/pdf/1709.01980">pdf</a>, <a href="https://arxiv.org/ps/1709.01980">ps</a>, <a href="https://arxiv.org/format/1709.01980">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5007652">10.1063/1.5007652 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=LEGEND+Collaboration"> LEGEND Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Abramov%2C+A">A. Abramov</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrosimov%2C+N">N. Abrosimov</a>, <a href="/search/nucl-ex?searchtype=author&query=Abt%2C+I">I. Abt</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Agartioglu%2C+M">M. Agartioglu</a>, <a href="/search/nucl-ex?searchtype=author&query=Ajjaq%2C+A">A. Ajjaq</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bolozdynya%2C+A">A. Bolozdynya</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Boston%2C+A">A. Boston</a>, <a href="/search/nucl-ex?searchtype=author&query=Boston%2C+H">H. Boston</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyd%2C+S+T+P">S. T. P. Boyd</a>, <a href="/search/nucl-ex?searchtype=author&query=Breier%2C+R">R. Breier</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a> , et al. (208 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1709.01980v1-abstract-short" style="display: inline;"> The observation of neutrinoless double-beta decay (0$谓尾尾$) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.01980v1-abstract-full').style.display = 'inline'; document.getElementById('1709.01980v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.01980v1-abstract-full" style="display: none;"> The observation of neutrinoless double-beta decay (0$谓尾尾$) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of $\sim$0.1 count /(FWHM$\cdot$t$\cdot$yr) in the region of the signal. The current generation $^{76}$Ge experiments GERDA and the MAJORANA DEMONSTRATOR utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0$谓尾尾$ signal region of all 0$谓尾尾$ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale $^{76}$Ge experiment. The collaboration aims to develop a phased 0$谓尾尾$ experimental program with discovery potential at a half-life approaching or at $10^{28}$ years, using existing resources as appropriate to expedite physics results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.01980v1-abstract-full').style.display = 'none'; document.getElementById('1709.01980v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conference Proceedings 1894, 020027 (2017); </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.07562">arXiv:1708.07562</a> <span> [<a href="https://arxiv.org/pdf/1708.07562">pdf</a>, <a href="https://arxiv.org/ps/1708.07562">ps</a>, <a href="https://arxiv.org/format/1708.07562">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5007635">10.1063/1.5007635 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Status and Initial Results of the MAJORANA DEMONSTRATOR Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1708.07562v1-abstract-short" style="display: inline;"> Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The MAJORANA Collaboration assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in Ge-76. The MAJORANA DEMONSTRATOR is comprised of 44.1 kg (29.7 kg enriched in Ge-76) of Ge de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.07562v1-abstract-full').style.display = 'inline'; document.getElementById('1708.07562v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.07562v1-abstract-full" style="display: none;"> Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The MAJORANA Collaboration assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in Ge-76. The MAJORANA DEMONSTRATOR is comprised of 44.1 kg (29.7 kg enriched in Ge-76) of Ge detectors divided between two modules contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota, USA. The initial goals of the DEMONSTRATOR are to establish the required background and scalability of a Ge-based next-generation ton-scale experiment. Following a commissioning run that started in 2015, the first detector module started low-background data production in early 2016. The second detector module was added in August 2016 to begin operation of the entire array. We discuss results of the initial physics runs, as well as the status and physics reach of the full MAJORANA DEMONSTRATOR experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.07562v1-abstract-full').style.display = 'none'; document.getElementById('1708.07562v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conference Proceedings 1894, 020010 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1707.06255">arXiv:1707.06255</a> <span> [<a href="https://arxiv.org/pdf/1707.06255">pdf</a>, <a href="https://arxiv.org/format/1707.06255">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2017.09.036">10.1016/j.nima.2017.09.036 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Processing of Enriched Germanium for the MAJORANA DEMONSTRATOR and R&D for a Possible Future Ton-Scale Ge-76 Double-Beta Decay Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caja%2C+J">J. Caja</a>, <a href="/search/nucl-ex?searchtype=author&query=Caja%2C+M">M. Caja</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunstan%2C+D+T">D. T. Dunstan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.06255v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in Ge-76 to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in Ge-76, special procedures were required to maximize the yield of detector mass and to minimize exposure… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.06255v1-abstract-full').style.display = 'inline'; document.getElementById('1707.06255v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.06255v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in Ge-76 to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in Ge-76, special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80 -- 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of Ge-68 by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of Ge-68 was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.06255v1-abstract-full').style.display = 'none'; document.getElementById('1707.06255v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to NIM-A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A 877 (2018) 314-322 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.02466">arXiv:1702.02466</a> <span> [<a href="https://arxiv.org/pdf/1702.02466">pdf</a>, <a href="https://arxiv.org/format/1702.02466">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2017.08.005">10.1016/j.nima.2017.08.005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Majorana Demonstrator calibration system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Boswell%2C+M">M. Boswell</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Fu%2C+Z">Z. Fu</a>, <a href="/search/nucl-ex?searchtype=author&query=Gehman%2C+V+M">V. M. Gehman</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1702.02466v1-abstract-short" style="display: inline;"> The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus $^{76}$Ge. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a 1-tonne $^{76}$Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioact… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.02466v1-abstract-full').style.display = 'inline'; document.getElementById('1702.02466v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.02466v1-abstract-full" style="display: none;"> The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus $^{76}$Ge. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a 1-tonne $^{76}$Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioactive line sources can be deployed around the cryostats containing the detectors for regular energy calibrations. When measuring in low-background mode, these line sources have to be stored outside the shielding so they do not contribute to the background. The deployment and the retraction of the source are designed to be controlled by the data acquisition system and do not require any direct human interaction. In this paper, we detail the design requirements and implementation of the calibration apparatus, which provides the event rates needed to define the pulse-shape cuts and energy calibration used in the final analysis as well as data that can be compared to simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.02466v1-abstract-full').style.display = 'none'; document.getElementById('1702.02466v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> NIM A 872 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.00886">arXiv:1612.00886</a> <span> [<a href="https://arxiv.org/pdf/1612.00886">pdf</a>, <a href="https://arxiv.org/ps/1612.00886">ps</a>, <a href="https://arxiv.org/format/1612.00886">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.118.161801">10.1103/PhysRevLett.118.161801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1612.00886v2-abstract-short" style="display: inline;"> We present new limits on exotic keV-scale physics based on 478 kg d of MAJORANA DEMONSTRATOR commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal-limits above our background. Our most stringent DM constraints are set for 11.8… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.00886v2-abstract-full').style.display = 'inline'; document.getElementById('1612.00886v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.00886v2-abstract-full" style="display: none;"> We present new limits on exotic keV-scale physics based on 478 kg d of MAJORANA DEMONSTRATOR commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal-limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting $g_{Ae} <4.5\times 10^{-13}$ for pseudoscalars and $\frac{伪'}伪 < 9.7\times 10^{-28}$ for vectors. We also report a 14.4 keV solar axion coupling limit of $g_{AN}^{\mathrm{eff}}\times g_{Ae}~<~3.8 \times 10^{-17}$, a $\frac{1}{2}尾^2~<~8.5\times10^{-48}$ limit on the strength of PEPV electron transitions, and a lower limit on the electron lifetime of $蟿_e > 1.2 \times 10^{24}\;$yr for $e^- \rightarrow$ invisible. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.00886v2-abstract-full').style.display = 'none'; document.getElementById('1612.00886v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 118, 161801 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.06141">arXiv:1610.06141</a> <span> [<a href="https://arxiv.org/pdf/1610.06141">pdf</a>, <a href="https://arxiv.org/format/1610.06141">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-016-4467-0">10.1140/epjc/s10052-016-4467-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Pauli Exclusion Principle Violating Atomic Transitions and Electron Decay with a P-type Point Contact Germanium Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A+S">A. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Finnerty%2C+P+S">P. S Finnerty</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (44 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.06141v1-abstract-short" style="display: inline;"> A search for Pauli-exclusion-principle-violating K-alpha electron transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger electr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06141v1-abstract-full').style.display = 'inline'; document.getElementById('1610.06141v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.06141v1-abstract-full" style="display: none;"> A search for Pauli-exclusion-principle-violating K-alpha electron transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell electrons into neutrinos, resulting in a lower limit of 6.8x10^30 seconds at 90 C.L. It is estimated that the MAJORANA DEMONSTRATOR, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76-Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06141v1-abstract-full').style.display = 'none'; document.getElementById('1610.06141v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.03054">arXiv:1610.03054</a> <span> [<a href="https://arxiv.org/pdf/1610.03054">pdf</a>, <a href="https://arxiv.org/format/1610.03054">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/888/1/012079">10.1088/1742-6596/888/1/012079 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Delayed charge recovery discrimination of passivated surface alpha events in P-type point-contact detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+H">P. H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Fullmer%2C+A">A. Fullmer</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.03054v1-abstract-short" style="display: inline;"> The Majorana Demonstrator searches for neutrinoless double-beta decay of $^{76}$Ge using arrays of high-purity germanium detectors. If observed, this process would demonstrate that lepton number is not a conserved quantity in nature, with implications for grand-unification and for explaining the predominance of matter over antimatter in the universe. A problematic background in such large granular… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.03054v1-abstract-full').style.display = 'inline'; document.getElementById('1610.03054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.03054v1-abstract-full" style="display: none;"> The Majorana Demonstrator searches for neutrinoless double-beta decay of $^{76}$Ge using arrays of high-purity germanium detectors. If observed, this process would demonstrate that lepton number is not a conserved quantity in nature, with implications for grand-unification and for explaining the predominance of matter over antimatter in the universe. A problematic background in such large granular detector arrays is posed by alpha particles. In the Majorana Demonstrator, events have been observed that are consistent with energy- degraded alphas originating on the passivated surface, leading to a potential background contribution in the region-of-interest for neutrinoless double-beta decay. However, it is also observed that when energy deposition occurs very close to the passivated surface, charges drift through the bulk onto that surface, and then drift along it with greatly reduced mobility. This leads to both a reduced prompt signal and a measurable change in slope of the tail of a recorded pulse. In this contribution we discuss the characteristics of these events and the development of a filter that can identify the occurrence of this delayed charge recovery, allowing for the efficient rejection of passivated surface alpha events in analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.03054v1-abstract-full').style.display = 'none'; document.getElementById('1610.03054v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 3 figures, Proceedings of the XXVII International Conference on Neutrino Physics and Astrophysics</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.01210">arXiv:1610.01210</a> <span> [<a href="https://arxiv.org/pdf/1610.01210">pdf</a>, <a href="https://arxiv.org/format/1610.01210">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/888/1/012035">10.1088/1742-6596/888/1/012035 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Initial Results from the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Fullmer%2C+A">A. Fullmer</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.01210v1-abstract-short" style="display: inline;"> Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The {\sc Majorana} Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The {\sc Majorana Demonstrator} is composed of 44.8~kg (29.7 kg enriched in $^{76}$Ge)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.01210v1-abstract-full').style.display = 'inline'; document.getElementById('1610.01210v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.01210v1-abstract-full" style="display: none;"> Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The {\sc Majorana} Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The {\sc Majorana Demonstrator} is composed of 44.8~kg (29.7 kg enriched in $^{76}$Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the {\sc Demonstrator} are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full {\sc Majorana Demonstrator} experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.01210v1-abstract-full').style.display = 'none'; document.getElementById('1610.01210v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Neutrino 2016 proceeding</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.01146">arXiv:1610.01146</a> <span> [<a href="https://arxiv.org/pdf/1610.01146">pdf</a>, <a href="https://arxiv.org/format/1610.01146">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/888/1/012240">10.1088/1742-6596/888/1/012240 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Background model for the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Fullmer%2C+A">A. Fullmer</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.01146v1-abstract-short" style="display: inline;"> The MAJORANA Collaboration is constructing a system containing 44 kg of high-purity Ge (HPGe) detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale to ~15 meV. To realize this, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/(ROI-t-y) in the 4… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.01146v1-abstract-full').style.display = 'inline'; document.getElementById('1610.01146v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.01146v1-abstract-full" style="display: none;"> The MAJORANA Collaboration is constructing a system containing 44 kg of high-purity Ge (HPGe) detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale to ~15 meV. To realize this, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/(ROI-t-y) in the 4 keV region of interest (ROI) around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials and analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements. Preliminary background results obtained during the engineering runs of the Demonstrator are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.01146v1-abstract-full').style.display = 'none'; document.getElementById('1610.01146v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.07340">arXiv:1608.07340</a> <span> [<a href="https://arxiv.org/pdf/1608.07340">pdf</a>, <a href="https://arxiv.org/format/1608.07340">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> The Majorana Demonstrator search for neutrinoless double beta decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Gruszko%2C+J">J. Gruszko</a>, <a href="/search/nucl-ex?searchtype=author&query=Guinn%2C+I+S">I. S. Guinn</a>, <a href="/search/nucl-ex?searchtype=author&query=Leon%2C+J">J. Leon</a>, <a href="/search/nucl-ex?searchtype=author&query=Robertson%2C+R+G+H">R. G. H. Robertson</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Mertens%2C+S">S. Mertens</a>, <a href="/search/nucl-ex?searchtype=author&query=Poon%2C+A+W+P">A. W. P. Poon</a>, <a href="/search/nucl-ex?searchtype=author&query=Vetter%2C+K">K. Vetter</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoppe%2C+E+W">E. W. Hoppe</a>, <a href="/search/nucl-ex?searchtype=author&query=Kouzes%2C+R+T">R. T. Kouzes</a>, <a href="/search/nucl-ex?searchtype=author&query=Orrell%2C+J+L">J. L. Orrell</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Konovalov%2C+S+I">S. I. Konovalov</a>, <a href="/search/nucl-ex?searchtype=author&query=Yumatov%2C+V">V. Yumatov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Radford%2C+D+C">D. C. Radford</a>, <a href="/search/nucl-ex?searchtype=author&query=Varner%2C+R+L">R. L. Varner</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1608.07340v2-abstract-short" style="display: inline;"> The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44.8-kg (29.7 kg enriched >88% in Ge-76) to search for neutrinoless double beta decay in Ge-76. The next generation of tonnescale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.07340v2-abstract-full').style.display = 'inline'; document.getElementById('1608.07340v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.07340v2-abstract-full" style="display: none;"> The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44.8-kg (29.7 kg enriched >88% in Ge-76) to search for neutrinoless double beta decay in Ge-76. The next generation of tonnescale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA DEMONSTRATOR is envisioned to demonstrate a path forward to achieve a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value of 2039 keV. The MAJORANA DEMONSTRATOR follows a modular implementation to be easily scalable to the next generation experiment. First data taken with the DEMONSTRATOR are introduced here. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.07340v2-abstract-full').style.display = 'none'; document.getElementById('1608.07340v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures, Proceedings of the XIIIth International Conference on Heavy Quarks and Leptons</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1605.01579">arXiv:1605.01579</a> <span> [<a href="https://arxiv.org/pdf/1605.01579">pdf</a>, <a href="https://arxiv.org/format/1605.01579">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/718/2/022013">10.1088/1742-6596/718/2/022013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct Neutrino Mass Experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mertens%2C+S">Susanne Mertens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.01579v1-abstract-short" style="display: inline;"> With a mass at least six orders of magnitudes smaller than the mass of an electron -- but non-zero -- neutrinos are a clear misfit in the Standard Model of Particle Physics. On the one hand, its tiny mass makes the neutrino one of the most interesting particles, one that might hold the key to physics beyond the Standard Model. On the other hand this minute mass leads to great challenges in its exp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.01579v1-abstract-full').style.display = 'inline'; document.getElementById('1605.01579v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.01579v1-abstract-full" style="display: none;"> With a mass at least six orders of magnitudes smaller than the mass of an electron -- but non-zero -- neutrinos are a clear misfit in the Standard Model of Particle Physics. On the one hand, its tiny mass makes the neutrino one of the most interesting particles, one that might hold the key to physics beyond the Standard Model. On the other hand this minute mass leads to great challenges in its experimental determination. Three approaches are currently pursued: An indirect neutrino mass determination via cosmological observables, the search for neutrinoless double $尾$-decay, and a direct measurement based on the kinematics of single $尾$-decay. In this paper the latter will be discussed in detail and the status and scientific reach of the current and near-future experiments will be presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.01579v1-abstract-full').style.display = 'none'; document.getElementById('1605.01579v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk presented at NuPhys2015 (London, 16-18 December 2015). 9 pages, LaTeX, 9 png figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> NuPhys2015-Mertens </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.08483">arXiv:1603.08483</a> <span> [<a href="https://arxiv.org/pdf/1603.08483">pdf</a>, <a href="https://arxiv.org/format/1603.08483">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2016.04.006">10.1016/j.nima.2016.04.006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High voltage testing for the MAJORANA Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Byram%2C+D">D. Byram</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A+S">A. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Fu%2C+Z">Z. Fu</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a> , et al. (48 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1603.08483v2-abstract-short" style="display: inline;"> The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector sign… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.08483v2-abstract-full').style.display = 'inline'; document.getElementById('1603.08483v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.08483v2-abstract-full" style="display: none;"> The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.08483v2-abstract-full').style.display = 'none'; document.getElementById('1603.08483v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 12 figures, 8 tables, submitted to NIM A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1602.07742">arXiv:1602.07742</a> <span> [<a href="https://arxiv.org/pdf/1602.07742">pdf</a>, <a href="https://arxiv.org/format/1602.07742">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.astropartphys.2017.01.013">10.1016/j.astropartphys.2017.01.013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon Flux Measurements at the Davis Campus of the Sanford Underground Research Facility with the Majorana Demonstrator Veto System </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Aguayo%2C+E">E. Aguayo</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Byram%2C+D">D. Byram</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A+S">A. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (49 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1602.07742v2-abstract-short" style="display: inline;"> We report the first measurement of the total MUON flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were done with the Majorana Demonstrator veto system arranged in two different configurations. The measured total flux is (5.31+/-0.17) x 10^-9 muons/s/cm^2. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1602.07742v2-abstract-full" style="display: none;"> We report the first measurement of the total MUON flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were done with the Majorana Demonstrator veto system arranged in two different configurations. The measured total flux is (5.31+/-0.17) x 10^-9 muons/s/cm^2. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.07742v2-abstract-full').style.display = 'none'; document.getElementById('1602.07742v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Astro. Phys. Volume 93 (2017) 70 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.03779">arXiv:1601.03779</a> <span> [<a href="https://arxiv.org/pdf/1601.03779">pdf</a>, <a href="https://arxiv.org/format/1601.03779">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2016.04.070">10.1016/j.nima.2016.04.070 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Majorana Demonstrator Radioassay Program </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Back%2C+H+O">H. O. Back</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Boswell%2C+M">M. Boswell</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Byram%2C+D">D. Byram</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A+S">A. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunmore%2C+J+A">J. A. Dunmore</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Finnerty%2C+P">P. Finnerty</a>, <a href="/search/nucl-ex?searchtype=author&query=Galindo-Uribarri%2C+A">A. Galindo-Uribarri</a>, <a href="/search/nucl-ex?searchtype=author&query=Gehman%2C+V+M">V. M. Gehman</a> , et al. (60 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.03779v3-abstract-short" style="display: inline;"> The MAJORANA collaboration is constructing the MAJORANA DEMONSTATOR at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope \nuc{76}{Ge}, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires tha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.03779v3-abstract-full').style.display = 'inline'; document.getElementById('1601.03779v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.03779v3-abstract-full" style="display: none;"> The MAJORANA collaboration is constructing the MAJORANA DEMONSTATOR at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope \nuc{76}{Ge}, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. The radioassay program conducted by the collaboration to ensure that the materials comprising the apparatus are sufficiently pure is described. The resulting measurements of the radioactive-isotope contamination for a number of materials studied for use in the detector are reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.03779v3-abstract-full').style.display = 'none'; document.getElementById('1601.03779v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">to be submitted to NIM</span> </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a 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