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is-link">Go</button> </div> </div> </form> </div> </div> <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/2402.18953">arXiv:2402.18953</a> <span> [<a href="https://arxiv.org/pdf/2402.18953">pdf</a>, <a href="https://arxiv.org/format/2402.18953">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> </div> </div> <p class="title is-5 mathjax"> Noise-Robust Detection of Quantum Phase Transitions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lively%2C+K">Kevin Lively</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">Tim Bode</a>, <a href="/search/physics?searchtype=author&query=Szangolies%2C+J">Jochen Szangolies</a>, <a href="/search/physics?searchtype=author&query=Zhu%2C+J">Jian-Xin Zhu</a>, <a href="/search/physics?searchtype=author&query=Fauseweh%2C+B">Benedikt Fauseweh</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="2402.18953v3-abstract-short" style="display: inline;"> Quantum computing allows for the manipulation of highly correlated states whose properties quickly go beyond the capacity of any classical method to calculate. Thus one natural problem which could lend itself to quantum advantage is the study of ground-states of condensed matter models, and the transitions between them. However, current levels of hardware noise can require extensive application of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.18953v3-abstract-full').style.display = 'inline'; document.getElementById('2402.18953v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.18953v3-abstract-full" style="display: none;"> Quantum computing allows for the manipulation of highly correlated states whose properties quickly go beyond the capacity of any classical method to calculate. Thus one natural problem which could lend itself to quantum advantage is the study of ground-states of condensed matter models, and the transitions between them. However, current levels of hardware noise can require extensive application of error-mitigation techniques to achieve reliable computations. In this work, we use several IBM devices to explore a finite-size spin model with multiple `phase-like' regions characterized by distinct ground-state configurations. Using pre-optimized Variational Quantum Eigensolver (VQE) solutions, we demonstrate that in contrast to calculating the energy, where zero-noise extrapolation is required in order to obtain qualitatively accurate yet still unreliable results, calculations of the energy derivative, two-site spin correlation functions, and the fidelity susceptibility yield accurate behavior across multiple regions, even with minimal or no application of error-mitigation approaches. Taken together, these sets of observables could be used to identify level crossings in a simple, noise-robust manner which is agnostic to the method of ground state preparation. This work shows promising potential for near-term application to identifying quantum phase transitions, including avoided crossings and non-adiabatic conical intersections in electronic structure calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.18953v3-abstract-full').style.display = 'none'; document.getElementById('2402.18953v3-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">11 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LA-UR-24-21698 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.14559">arXiv:2111.14559</a> <span> [<a href="https://arxiv.org/pdf/2111.14559">pdf</a>, <a href="https://arxiv.org/format/2111.14559">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-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/10.1088/1751-8121/ac73c6">10.1088/1751-8121/ac73c6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Two-Particle Irreducible Effective Action for Classical Stochastic Processes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bode%2C+T">Tim Bode</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="2111.14559v2-abstract-short" style="display: inline;"> By combining the two-particle-irreducible (2PI) effective action common in non-equilibrium quantum field theory with the classical Martin-Siggia-Rose formalism, self-consistent equations of motion for the first and second cumulants of non-linear classical stochastic processes are constructed. Such dynamical equations for correlation and response functions are important in describing non-equilibriu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.14559v2-abstract-full').style.display = 'inline'; document.getElementById('2111.14559v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.14559v2-abstract-full" style="display: none;"> By combining the two-particle-irreducible (2PI) effective action common in non-equilibrium quantum field theory with the classical Martin-Siggia-Rose formalism, self-consistent equations of motion for the first and second cumulants of non-linear classical stochastic processes are constructed. Such dynamical equations for correlation and response functions are important in describing non-equilibrium systems, where equilibrium fluctuation-dissipation relations are unavailable. The method allows to evolve stochastic systems from arbitrary Gaussian initial conditions. In the non-linear case, it is found that the resulting integro-differential equations can be solved with considerably reduced computational effort compared to state-of-the-art stochastic Runge-Kutta methods. The details of the method are illustrated by several physical examples. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.14559v2-abstract-full').style.display = 'none'; document.getElementById('2111.14559v2-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 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 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">23 pages, 8 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/2110.04793">arXiv:2110.04793</a> <span> [<a href="https://arxiv.org/pdf/2110.04793">pdf</a>, <a href="https://arxiv.org/format/2110.04793">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-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/10.21468/SciPostPhysCore.5.2.030">10.21468/SciPostPhysCore.5.2.030 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Adaptive Numerical Solution of Kadanoff-Baym Equations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Meirinhos%2C+F">Francisco Meirinhos</a>, <a href="/search/physics?searchtype=author&query=Kajan%2C+M">Michael Kajan</a>, <a href="/search/physics?searchtype=author&query=Kroha%2C+J">Johann Kroha</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">Tim Bode</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="2110.04793v2-abstract-short" style="display: inline;"> A time-stepping scheme with adaptivity in both the step size and the integration order is presented in the context of non-equilibrium dynamics described via Kadanoff-Baym equations. The accuracy and effectiveness of the algorithm are analysed by obtaining numerical solutions of exactly solvable models. We find a significant reduction in the number of time-steps compared to fixed-step methods. Due… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.04793v2-abstract-full').style.display = 'inline'; document.getElementById('2110.04793v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.04793v2-abstract-full" style="display: none;"> A time-stepping scheme with adaptivity in both the step size and the integration order is presented in the context of non-equilibrium dynamics described via Kadanoff-Baym equations. The accuracy and effectiveness of the algorithm are analysed by obtaining numerical solutions of exactly solvable models. We find a significant reduction in the number of time-steps compared to fixed-step methods. Due to the at least quadratic scaling of Kadanoff-Baym equations, reducing the amount of steps can dramatically increase the accessible integration time, opening the door for the study of long-time dynamics in interacting systems. A selection of illustrative examples is provided, among them interacting and open quantum systems as well as classical stochastic processes. An open-source implementation of our algorithm in the scientific-computing language Julia is made available. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.04793v2-abstract-full').style.display = 'none'; document.getElementById('2110.04793v2-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 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 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">37 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> SciPost Phys. Core 5, 030 (2022) </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/physics?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/physics?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/physics?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/1903.00563">arXiv:1903.00563</a> <span> [<a href="https://arxiv.org/pdf/1903.00563">pdf</a>, <a href="https://arxiv.org/format/1903.00563">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> </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/s10052-019-7320-4">10.1140/epjc/s10052-019-7320-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gamma-induced background in the KATRIN main spectrometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Block%2C+F">F. Block</a>, <a href="/search/physics?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bouquet%2C+H">H. Bouquet</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/physics?searchtype=author&query=Eitel%2C+K">K. Eitel</a> , et al. (101 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="1903.00563v2-abstract-short" style="display: inline;"> The KATRIN experiment aims to measure the effective electron antineutrino mass $m_{\overline谓_e}$ with a sensitivity of 0.2 eV/c$^2$ using a gaseous tritium source combined with the MAC-E filter technique. A low background rate is crucial to achieving the proposed sensitivity, and dedicated measurements have been performed to study possible sources of background electrons. In this work, we test th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.00563v2-abstract-full').style.display = 'inline'; document.getElementById('1903.00563v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.00563v2-abstract-full" style="display: none;"> The KATRIN experiment aims to measure the effective electron antineutrino mass $m_{\overline谓_e}$ with a sensitivity of 0.2 eV/c$^2$ using a gaseous tritium source combined with the MAC-E filter technique. A low background rate is crucial to achieving the proposed sensitivity, and dedicated measurements have been performed to study possible sources of background electrons. In this work, we test the hypothesis that gamma radiation from external radioactive sources significantly increases the rate of background events created in the main spectrometer (MS) and observed in the focal-plane detector. Using detailed simulations of the gamma flux in the experimental hall, combined with a series of experimental tests that artificially increased or decreased the local gamma flux to the MS, we set an upper limit of 0.006 count/s (90% C.L.) from this mechanism. Our results indicate the effectiveness of the electrostatic and magnetic shielding used to block secondary electrons emitted from the inner surface of the MS. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.00563v2-abstract-full').style.display = 'none'; document.getElementById('1903.00563v2-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 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.06590">arXiv:1901.06590</a> <span> [<a href="https://arxiv.org/pdf/1901.06590">pdf</a>, <a href="https://arxiv.org/format/1901.06590">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> </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/s10052-019-7353-8">10.1140/epjc/s10052-019-7353-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of 30 $^{76}$Ge enriched Broad Energy Ge detectors for GERDA Phase II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=GERDA+collaboration"> GERDA collaboration</a>, <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a> , et al. (90 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="1901.06590v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) is a low background experiment located at the Laboratori Nazionali del Gran Sasso in Italy, which searches for neutrinoless double beta decay of $^{76}$Ge into $^{76}$Se+2e$^-$. GERDA has been conceived in two phases. Phase II, which started in December 2015, features several novelties including 30 new Ge detectors. These were manufactured according to the Broa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06590v1-abstract-full').style.display = 'inline'; document.getElementById('1901.06590v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.06590v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) is a low background experiment located at the Laboratori Nazionali del Gran Sasso in Italy, which searches for neutrinoless double beta decay of $^{76}$Ge into $^{76}$Se+2e$^-$. GERDA has been conceived in two phases. Phase II, which started in December 2015, features several novelties including 30 new Ge detectors. These were manufactured according to the Broad Energy Germanium (BEGe) detector design that has a better background discrimination capability and energy resolution compared to formerly widely-used types. Prior to their installation, the new BEGe detectors were mounted in vacuum cryostats and characterized in detail in the HADES underground laboratory in Belgium. This paper describes the properties and the overall performance of these detectors during operation in vacuum. The characterization campaign provided not only direct input for GERDA Phase II data collection and analyses, but also allowed to study detector phenomena, detector correlations as well as to test the strength of pulse shape simulation codes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06590v1-abstract-full').style.display = 'none'; document.getElementById('1901.06590v1-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 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">29 pages, 18 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 79, 978 (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/physics?searchtype=author&query=Myslik%2C+J">J. Myslik</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/physics?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/1810.06711">arXiv:1810.06711</a> <span> [<a href="https://arxiv.org/pdf/1810.06711">pdf</a>, <a href="https://arxiv.org/format/1810.06711">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> </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/ab12fe">10.1088/1361-6471/ab12fe <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A novel detector system for KATRIN to search for keV-scale sterile neutrinos </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mertens%2C+S">Susanne Mertens</a>, <a href="/search/physics?searchtype=author&query=Alborini%2C+A">Antonio Alborini</a>, <a href="/search/physics?searchtype=author&query=Altenm%C3%BCller%2C+K">Konrad Altenm眉ller</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">Tobias Bode</a>, <a href="/search/physics?searchtype=author&query=Bombelli%2C+L">Luca Bombelli</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">Tim Brunst</a>, <a href="/search/physics?searchtype=author&query=Carminati%2C+M">Marco Carminati</a>, <a href="/search/physics?searchtype=author&query=Fink%2C+D">David Fink</a>, <a href="/search/physics?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/physics?searchtype=author&query=Houdy%2C+T">Thibaut Houdy</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+A">Anton Huber</a>, <a href="/search/physics?searchtype=author&query=Korzeczek%2C+M">Marc Korzeczek</a>, <a href="/search/physics?searchtype=author&query=Lasserre%2C+T">Thierry Lasserre</a>, <a href="/search/physics?searchtype=author&query=Lechner%2C+P">Peter Lechner</a>, <a href="/search/physics?searchtype=author&query=Manotti%2C+M">Michele Manotti</a>, <a href="/search/physics?searchtype=author&query=Peric%2C+I">Ivan Peric</a>, <a href="/search/physics?searchtype=author&query=Radford%2C+D+C">David C. Radford</a>, <a href="/search/physics?searchtype=author&query=Siegmann%2C+D">Daniel Siegmann</a>, <a href="/search/physics?searchtype=author&query=Slez%C3%A1k%2C+M">Martin Slez谩k</a>, <a href="/search/physics?searchtype=author&query=Valerius%2C+K">Kathrin Valerius</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+J">Joachim Wolf</a>, <a href="/search/physics?searchtype=author&query=W%C3%BCstling%2C+S">Sascha W眉stling</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="1810.06711v1-abstract-short" style="display: inline;"> Sterile neutrinos are a minimal extension of the Standard Model of Particle Physics. If their mass is in the kilo-electron-volt regime, they are viable dark matter candidates. One way to search for sterile neutrinos in a laboratory-based experiment is via tritium-beta decay, where the new neutrino mass eigenstate would manifest itself as a kink-like distortion of the $尾$-decay spectrum. The object… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.06711v1-abstract-full').style.display = 'inline'; document.getElementById('1810.06711v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.06711v1-abstract-full" style="display: none;"> Sterile neutrinos are a minimal extension of the Standard Model of Particle Physics. If their mass is in the kilo-electron-volt regime, they are viable dark matter candidates. One way to search for sterile neutrinos in a laboratory-based experiment is via tritium-beta decay, where the new neutrino mass eigenstate would manifest itself as a kink-like distortion of the $尾$-decay spectrum. The objective of the TRISTAN project is to extend the KATRIN setup with a new multi-pixel silicon drift detector system to search for a keV-scale sterile neutrino signal. In this paper we describe the requirements of such a new detector, and present first characterization measurement results obtained with a 7-pixel prototype system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.06711v1-abstract-full').style.display = 'none'; document.getElementById('1810.06711v1-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> 15 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.08312">arXiv:1806.08312</a> <span> [<a href="https://arxiv.org/pdf/1806.08312">pdf</a>, <a href="https://arxiv.org/format/1806.08312">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> </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/10.1088/1748-0221/13/08/T08005">10.1088/1748-0221/13/08/T08005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The KATRIN Superconducting Magnets: Overview and First Performance Results </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/physics?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/physics?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/physics?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a>, <a href="/search/physics?searchtype=author&query=Engel%2C+R">R. Engel</a> , et al. (99 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="1806.08312v2-abstract-short" style="display: inline;"> The KATRIN experiment aims for the determination of the effective electron anti-neutrino mass from the tritium beta-decay with an unprecedented sub-eV sensitivity. The strong magnetic fields, designed for up to 6~T, adiabatically guide $尾$-electrons from the source to the detector within a magnetic flux of 191~Tcm$^2$. A chain of ten single solenoid magnets and two larger superconducting magnet sy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08312v2-abstract-full').style.display = 'inline'; document.getElementById('1806.08312v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.08312v2-abstract-full" style="display: none;"> The KATRIN experiment aims for the determination of the effective electron anti-neutrino mass from the tritium beta-decay with an unprecedented sub-eV sensitivity. The strong magnetic fields, designed for up to 6~T, adiabatically guide $尾$-electrons from the source to the detector within a magnetic flux of 191~Tcm$^2$. A chain of ten single solenoid magnets and two larger superconducting magnet systems have been designed, constructed, and installed in the 70-m-long KATRIN beam line. The beam diameter for the magnetic flux varies from 0.064~m to 9~m, depending on the magnetic flux density along the beam line. Two transport and tritium pumping sections are assembled with chicane beam tubes to avoid direct "line-of-sight" molecular beaming effect of gaseous tritium molecules into the next beam sections. The sophisticated beam alignment has been successfully cross-checked by electron sources. In addition, magnet safety systems were developed to protect the complex magnet systems against coil quenches or other system failures. The main functionality of the magnet safety systems has been successfully tested with the two large magnet systems. The complete chain of the magnets was operated for several weeks at 70$\%$ of the design fields for the first test measurements with radioactive krypton gas. The stability of the magnetic fields of the source magnets has been shown to be better than 0.01$\%$ per month at 70$\%$ of the design fields. This paper gives an overview of the KATRIN superconducting magnets and reports on the first performance results of the magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08312v2-abstract-full').style.display = 'none'; document.getElementById('1806.08312v2-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 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </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/physics?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Bobien%2C+S">S. Bobien</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/physics?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/physics?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/1805.01163">arXiv:1805.01163</a> <span> [<a href="https://arxiv.org/pdf/1805.01163">pdf</a>, <a href="https://arxiv.org/format/1805.01163">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> </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/s10052-018-6244-8">10.1140/epjc/s10052-018-6244-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=KATRIN+Collaboration"> KATRIN Collaboration</a>, <a href="/search/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+S">S. Bauer</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Berendes%2C+R">R. Berendes</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buglak%2C+W">W. Buglak</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a> , et al. (105 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="1805.01163v1-abstract-short" style="display: inline;"> The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of $0.2\,{\text{eV}/c^2}$ (90\% C.L.) by precision measurement of the shape of the tritium \textbeta-spectrum in the endpoint region. The energy analysis of the decay electrons is achieved by a MAC-E filter spectrometer. A common background source in this setup is the decay of short-lived isotopes, such… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.01163v1-abstract-full').style.display = 'inline'; document.getElementById('1805.01163v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.01163v1-abstract-full" style="display: none;"> The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of $0.2\,{\text{eV}/c^2}$ (90\% C.L.) by precision measurement of the shape of the tritium \textbeta-spectrum in the endpoint region. The energy analysis of the decay electrons is achieved by a MAC-E filter spectrometer. A common background source in this setup is the decay of short-lived isotopes, such as $\textsuperscript{219}$Rn and $\textsuperscript{220}$Rn, in the spectrometer volume. Active and passive countermeasures have been implemented and tested at the KATRIN main spectrometer. One of these is the magnetic pulse method, which employs the existing air coil system to reduce the magnetic guiding field in the spectrometer on a short timescale in order to remove low- and high-energy stored electrons. Here we describe the working principle of this method and present results from commissioning measurements at the main spectrometer. Simulations with the particle-tracking software Kassiopeia were carried out to gain a detailed understanding of the electron storage conditions and removal processes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.01163v1-abstract-full').style.display = 'none'; document.getElementById('1805.01163v1-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 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">16 pages, 9 figures, 4 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2018) 78: 778 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.01582">arXiv:1804.01582</a> <span> [<a href="https://arxiv.org/pdf/1804.01582">pdf</a>, <a href="https://arxiv.org/format/1804.01582">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> </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/10.1142/S2010194518600492">10.1142/S2010194518600492 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </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/physics?searchtype=author&query=Gilliss%2C+T">T Gilliss</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S I Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I J Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F T Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A S Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C J Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F E Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T Bode</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T S Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C D Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P -H Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J A Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S R Elliott</a>, <a href="/search/physics?searchtype=author&query=Giovanetti%2C+G+K">G K Giovanetti</a>, <a href="/search/physics?searchtype=author&query=Green%2C+M+P">M P Green</a>, <a href="/search/physics?searchtype=author&query=Gruszko%2C+J">J Gruszko</a>, <a href="/search/physics?searchtype=author&query=Guinn%2C+I+S">I S Guinn</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="1804.01582v1-abstract-short" style="display: inline;"> The MAJORANA Collaboration has completed construction and is now operating an array of high purity Ge detectors searching for neutrinoless double-beta decay ($0谓尾尾$) in $^{76}$Ge. The array, known as the MAJORANA DEMONSTRATOR, is comprised of 44 kg of Ge detectors (30 kg enriched to 88% in $^{76}$Ge) installed in an ultra-low background compact shield at the Sanford Underground Research Facility i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.01582v1-abstract-full').style.display = 'inline'; document.getElementById('1804.01582v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.01582v1-abstract-full" style="display: none;"> The MAJORANA Collaboration has completed construction and is now operating an array of high purity Ge detectors searching for neutrinoless double-beta decay ($0谓尾尾$) in $^{76}$Ge. The array, known as the MAJORANA DEMONSTRATOR, is comprised of 44 kg of Ge detectors (30 kg enriched to 88% in $^{76}$Ge) installed in an ultra-low background compact shield at the Sanford Underground Research Facility in Lead, South Dakota. The primary goal of the DEMONSTRATOR is to establish a low-background design that can be scaled to a next-generation tonne-scale experiment. This work reports initial background levels in the $0谓尾尾$ region of interest. Also presented are recent physics results leveraging P-type point-contact detectors with sub-keV energy thresholds to search for physics beyond the Standard Model; first results from searches for bosonic dark matter, solar axions, Pauli exclusion principle violation, and electron decay have been published. Finally, this work discusses the proposed tonne-scale $^{76}$Ge $0谓尾尾$ LEGEND experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.01582v1-abstract-full').style.display = 'none'; document.getElementById('1804.01582v1-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 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">6 pages, 1 figure, PANIC 2017: 21st Particles and Nuclei International Conference</span> </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/physics?searchtype=author&query=Yu%2C+C+-">C. -H. Yu</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y+-">Y. -D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/physics?searchtype=author&query=Green%2C+M">M. Green</a>, <a href="/search/physics?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/1803.11100">arXiv:1803.11100</a> <span> [<a href="https://arxiv.org/pdf/1803.11100">pdf</a>, <a href="https://arxiv.org/format/1803.11100">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.120.132503">10.1103/PhysRevLett.120.132503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Improved limit on neutrinoless double beta decay of $^{76}$Ge from GERDA Phase II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Biernat%2C+J">J. Biernat</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=Comellato%2C+T">T. Comellato</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/physics?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/physics?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/physics?searchtype=author&query=Egorov%2C+V">V. Egorov</a> , et al. (83 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="1803.11100v1-abstract-short" style="display: inline;"> The GERDA experiment searches for the lepton number violating neutrinoless double beta decay of $^{76}$Ge ($^{76}$Ge $\rightarrow$ $^{76}$Se + 2e$^-$) operating bare Ge diodes with an enriched $^{76}$Ge fraction in liquid argon. The exposure for BEGe-type detectors is increased threefold with respect to our previous data release. The BEGe detectors feature an excellent background suppression from… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.11100v1-abstract-full').style.display = 'inline'; document.getElementById('1803.11100v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.11100v1-abstract-full" style="display: none;"> The GERDA experiment searches for the lepton number violating neutrinoless double beta decay of $^{76}$Ge ($^{76}$Ge $\rightarrow$ $^{76}$Se + 2e$^-$) operating bare Ge diodes with an enriched $^{76}$Ge fraction in liquid argon. The exposure for BEGe-type detectors is increased threefold with respect to our previous data release. The BEGe detectors feature an excellent background suppression from the analysis of the time profile of the detector signals. In the analysis window a background level of $1.0_{-0.4}^{+0.6}\cdot10^{-3}$ cts/(keV$\cdot$kg$\cdot$yr) has been achieved; if normalized to the energy resolution this is the lowest ever achieved in any 0$谓尾尾$ experiment. No signal is observed and a new 90 \% C.L. lower limit for the half-life of $8.0\cdot10^{25}$ yr is placed when combining with our previous data. The median expected sensitivity assuming no signal is $5.8\cdot10^{25}$ yr. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.11100v1-abstract-full').style.display = 'none'; document.getElementById('1803.11100v1-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</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( 2018) 132503 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.05227">arXiv:1802.05227</a> <span> [<a href="https://arxiv.org/pdf/1802.05227">pdf</a>, <a href="https://arxiv.org/format/1802.05227">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> </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/s10052-018-5832-y">10.1140/epjc/s10052-018-5832-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Calibration of high voltages at the ppm level by the difference of $^{83\mathrm{m}}$Kr conversion electron lines at the KATRIN experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/physics?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/physics?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/physics?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a>, <a href="/search/physics?searchtype=author&query=Engel%2C+R">R. Engel</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="1802.05227v2-abstract-short" style="display: inline;"> The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at -18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage divid… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05227v2-abstract-full').style.display = 'inline'; document.getElementById('1802.05227v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.05227v2-abstract-full" style="display: none;"> The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at -18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers required bringing the equipment to the specialised metrology laboratory. Here we present a new method based on measuring the energy difference of two $^{83\mathrm{m}}$Kr conversion electron lines with the KATRIN setup, which was demonstrated during KATRIN's commissioning measurements in July 2017. The measured scale factor $M=1972.449(10)$ of the high-voltage divider K35 is in agreement with the last PTB calibration four years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05227v2-abstract-full').style.display = 'none'; document.getElementById('1802.05227v2-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> 15 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 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">7 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2018) 78:368 </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/physics?searchtype=author&query=Arenz%2C+M">M. Arenz</a>, <a href="/search/physics?searchtype=author&query=Baek%2C+W+-">W. -J. Baek</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+M">M. Beck</a>, <a href="/search/physics?searchtype=author&query=Beglarian%2C+A">A. Beglarian</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+T">T. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Berlev%2C+A">A. Berlev</a>, <a href="/search/physics?searchtype=author&query=Besserer%2C+U">U. Besserer</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+B">B. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Bornschein%2C+L">L. Bornschein</a>, <a href="/search/physics?searchtype=author&query=Brunst%2C+T">T. Brunst</a>, <a href="/search/physics?searchtype=author&query=Buzinsky%2C+N">N. Buzinsky</a>, <a href="/search/physics?searchtype=author&query=Chilingaryan%2C+S">S. Chilingaryan</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+W+Q">W. Q. Choi</a>, <a href="/search/physics?searchtype=author&query=Deffert%2C+M">M. Deffert</a>, <a href="/search/physics?searchtype=author&query=Doe%2C+P+J">P. J. Doe</a>, <a href="/search/physics?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/physics?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/physics?searchtype=author&query=Dyba%2C+S">S. Dyba</a>, <a href="/search/physics?searchtype=author&query=Edzards%2C+F">F. Edzards</a>, <a href="/search/physics?searchtype=author&query=Eitel%2C+K">K. Eitel</a>, <a href="/search/physics?searchtype=author&query=Ellinger%2C+E">E. Ellinger</a>, <a href="/search/physics?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/1801.08182">arXiv:1801.08182</a> <span> [<a href="https://arxiv.org/pdf/1801.08182">pdf</a>, <a href="https://arxiv.org/format/1801.08182">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> </div> </div> <p class="title is-5 mathjax"> Detector Development for a Sterile Neutrino Search with the KATRIN Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brunst%2C+T">Tim Brunst</a>, <a href="/search/physics?searchtype=author&query=Altenm%C3%BCller%2C+K">Konrad Altenm眉ller</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">Tobias Bode</a>, <a href="/search/physics?searchtype=author&query=Bombelli%2C+L">Luca Bombelli</a>, <a href="/search/physics?searchtype=author&query=Chernov%2C+V">Vasiliy Chernov</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+A">Anton Huber</a>, <a href="/search/physics?searchtype=author&query=Korzeczek%2C+M">Marc Korzeczek</a>, <a href="/search/physics?searchtype=author&query=Lasserre%2C+T">Thierry Lasserre</a>, <a href="/search/physics?searchtype=author&query=Lechner%2C+P">Peter Lechner</a>, <a href="/search/physics?searchtype=author&query=Mertens%2C+S">Susanne Mertens</a>, <a href="/search/physics?searchtype=author&query=Nozik%2C+A">Aleksander Nozik</a>, <a href="/search/physics?searchtype=author&query=Pantuev%2C+V">Vladislav Pantuev</a>, <a href="/search/physics?searchtype=author&query=Siegmann%2C+D">Daniel Siegmann</a>, <a href="/search/physics?searchtype=author&query=Skasyrskaya%2C+A">Aino Skasyrskaya</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="1801.08182v1-abstract-short" style="display: inline;"> The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the energetic endpoint of the tritium $尾$-decay spectrum to determine the effective mass of the electron anti-neutrino with a precision of $200\,\mathrm{meV}$ ($90\,\%$ C.L.) after an effective data taking time of three years. The TRISTAN (tritium $尾$-decay to search for sterile neutrinos) group aims to detect a sterile neutrino sig… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.08182v1-abstract-full').style.display = 'inline'; document.getElementById('1801.08182v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.08182v1-abstract-full" style="display: none;"> The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the energetic endpoint of the tritium $尾$-decay spectrum to determine the effective mass of the electron anti-neutrino with a precision of $200\,\mathrm{meV}$ ($90\,\%$ C.L.) after an effective data taking time of three years. The TRISTAN (tritium $尾$-decay to search for sterile neutrinos) group aims to detect a sterile neutrino signature by measuring the entire tritium $尾$-decay spectrum with an upgraded KATRIN system. One of the greatest challenges is to handle the high signal rates generated by the strong activity of the KATRIN tritium source. Therefore, a novel multi-pixel silicon drift detector is being designed, which is able to handle rates up to $10^{8}\,\mathrm{cps}$ with an excellent energy resolution of $<200\,\mathrm{eV}$ (FWHM) at $10\,\mathrm{keV}$. This work gives an overview of the ongoing detector development and test results of the first seven pixel prototype detectors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.08182v1-abstract-full').style.display = 'none'; document.getElementById('1801.08182v1-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 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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, 6 figures, Proceedings of the 7th International Pontecorvo Neutrino Physics School</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.04985">arXiv:1712.04985</a> <span> [<a href="https://arxiv.org/pdf/1712.04985">pdf</a>, <a href="https://arxiv.org/format/1712.04985">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> </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/10.1063/1.5019005">10.1063/1.5019005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Low Background Materials and Fabrication Techniques for Cables and Connectors in the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/physics?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="1712.04985v1-abstract-short" style="display: inline;"> The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus Ge-76. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale Ge-76-based search (the LEGEND collaboration). In the DEMONSTRATOR, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.04985v1-abstract-full').style.display = 'inline'; document.getElementById('1712.04985v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.04985v1-abstract-full" style="display: none;"> The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus Ge-76. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale Ge-76-based search (the LEGEND collaboration). In the DEMONSTRATOR, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One special challenge of an ultra-pure environment is to develop reliable cables, connectors, and electronics that do not significantly contribute to the radioactive background of the experiment. This paper highlights the experimental requirements and how these requirements were met for the MAJORANA DEMONSTRATOR, including plans to upgrade the wiring for higher reliability in the summer of 2018. Also described are requirements for LEGEND R&D efforts underway to meet these additional requirements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.04985v1-abstract-full').style.display = 'none'; document.getElementById('1712.04985v1-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, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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 LRT 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 1921, 070002 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.03459">arXiv:1712.03459</a> <span> [<a href="https://arxiv.org/pdf/1712.03459">pdf</a>, <a href="https://arxiv.org/format/1712.03459">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> </div> </div> <p class="title is-5 mathjax"> Design improvements to cables and connectors in the Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Haufe%2C+C+R">C. R. Haufe</a>, <a href="/search/physics?searchtype=author&query=Reine%2C+A+L">A. L. Reine</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y+-">Y. -D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</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="1712.03459v1-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 76Ge-enriched germanium p-type point contact detectors totaling 44.1 kg, located at the 4850 level of the Sanford Underground Researc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.03459v1-abstract-full').style.display = 'inline'; document.getElementById('1712.03459v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.03459v1-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 76Ge-enriched germanium p-type point contact detectors totaling 44.1 kg, located at the 4850 level of the Sanford Underground Research Facility in Lead, South Dakota, USA. The Demonstrator uses custom high voltage cables to bias the detectors, as well as custom signal cables and connectors to read out the charge deposited at the point contact of each detector. These low-mass cables and connectors must meet stringent radiopurity requirements while being subjected to thermal and mechanical stress. A number of issues have been identified with the currently installed cables and connectors. An improved set of cables and connectors for the Majorana Demonstrator are being developed with the aim of increasing their overall reliability and connectivity. We will discuss some of the issues encountered with the current cables and connectors as well as our improved designs and their initial performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.03459v1-abstract-full').style.display = 'none'; document.getElementById('1712.03459v1-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 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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 pages, 2 figures, TAUP 2017: XV International Conference on Topics in Astroparticle and Underground Physics</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.11145">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/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?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/1711.10550">arXiv:1711.10550</a> <span> [<a href="https://arxiv.org/pdf/1711.10550">pdf</a>, <a href="https://arxiv.org/format/1711.10550">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> </div> </div> <p class="title is-5 mathjax"> Data quality assurance for the MAJORANA DEMONSTRATOR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Myslik%2C+J">J. Myslik</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P">P-H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?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="1711.10550v1-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 large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.10550v1-abstract-full').style.display = 'inline'; document.getElementById('1711.10550v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.10550v1-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 large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Any neutrinoless double-beta decay search requires a thorough understanding of the background and the signal energy spectra. The various techniques employed to ensure the integrity of the measured spectra are discussed. Data collection is monitored with a thorough set of checks, and subsequent careful analysis is performed to qualify the data for higher level physics analysis. Instrumental background events are tagged for removal, and problematic channels are removed from consideration as necessary. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.10550v1-abstract-full').style.display = 'none'; document.getElementById('1711.10550v1-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">5 pages, 2 figures, Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics (Sudbury ON, Canada, July 24-28, 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/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/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/physics?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/1711.05801">arXiv:1711.05801</a> <span> [<a href="https://arxiv.org/pdf/1711.05801">pdf</a>, <a href="https://arxiv.org/format/1711.05801">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> </div> </div> <p class="title is-5 mathjax"> Progress Toward A $2谓尾尾$ Measurement For The Majorana Demonstrator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T Gilliss</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S I Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I J Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F T Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A S Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C J Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F E Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A W Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T S Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C D Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P -H Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J A Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S R Elliott</a>, <a href="/search/physics?searchtype=author&query=Giovanetti%2C+G+K">G K Giovanetti</a>, <a href="/search/physics?searchtype=author&query=Green%2C+M+P">M P Green</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="1711.05801v2-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is a $^{76}$Ge-based neutrinoless double-beta decay ($0谓尾尾$) experiment. Staged at the 4850 ft level of the Sanford Underground Research Facility, the DEMONSTRATOR operates an array of high-purity p-type point contact Ge detectors deployed within a graded passive shield and an active muon veto system. The present work concerns the two-neutrino double-beta decay mode (… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05801v2-abstract-full').style.display = 'inline'; document.getElementById('1711.05801v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.05801v2-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is a $^{76}$Ge-based neutrinoless double-beta decay ($0谓尾尾$) experiment. Staged at the 4850 ft level of the Sanford Underground Research Facility, the DEMONSTRATOR operates an array of high-purity p-type point contact Ge detectors deployed within a graded passive shield and an active muon veto system. The present work concerns the two-neutrino double-beta decay mode ($2谓尾尾$) of $^{76}$Ge. For Ge detectors, having superior energy resolution (0.1%), this mode poses negligible background to the $0谓尾尾$ mode, even for a ton-scale experiment. However, the measurement of the $2谓尾尾$ mode allows for careful systematics checks of active detector mass, enrichment fraction, and pulse shape discrimination cuts related to both the $0谓尾尾$ and $2谓尾尾$ decay modes. A precision measurement of the $2谓尾尾$ shape also allows searches for spectral distortions, possibly indicative of new physics, including $0谓尾尾蠂$. Work is underway to construct a full experimental background model enabling a Bayesian fit to the measured energy spectrum and extraction of a precise $2谓尾尾$ spectrum and half-life. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.05801v2-abstract-full').style.display = 'none'; document.getElementById('1711.05801v2-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> 20 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 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 pages, 2 figures, TAUP 2017: XV International Conference on Topics in Astroparticle and Underground Physics</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.03177">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/physics?searchtype=author&query=Hehn%2C+L">L. Hehn</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P">P-H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?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/1711.01452">arXiv:1711.01452</a> <span> [<a href="https://arxiv.org/pdf/1711.01452">pdf</a>, <a href="https://arxiv.org/format/1711.01452">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/10.1140/epjc/s10052-018-5812-2">10.1140/epjc/s10052-018-5812-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Upgrade for Phase II of the GERDA Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/physics?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/physics?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/physics?searchtype=author&query=Egorov%2C+V">V. Egorov</a> , et al. (89 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="1711.01452v1-abstract-short" style="display: inline;"> The GERDA collaboration is performing a sensitive search for neutrinoless double beta decay of $^{76}$Ge at the INFN Laboratori Nazionali del Gran Sasso, Italy. The upgrade of the GERDA experiment from Phase I to Phase II has been concluded in December 2015. The first Phase II data release shows that the goal to suppress the background by one order of magnitude compared to Phase I has been achieve… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01452v1-abstract-full').style.display = 'inline'; document.getElementById('1711.01452v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.01452v1-abstract-full" style="display: none;"> The GERDA collaboration is performing a sensitive search for neutrinoless double beta decay of $^{76}$Ge at the INFN Laboratori Nazionali del Gran Sasso, Italy. The upgrade of the GERDA experiment from Phase I to Phase II has been concluded in December 2015. The first Phase II data release shows that the goal to suppress the background by one order of magnitude compared to Phase I has been achieved. GERDA is thus the first experiment that will remain background-free up to its design exposure (100 kg yr). It will reach thereby a half-life sensitivity of more than 10$^{26}$ yr within 3 years of data collection. This paper describes in detail the modifications and improvements of the experimental setup for Phase II and discusses the performance of individual detector components. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01452v1-abstract-full').style.display = 'none'; document.getElementById('1711.01452v1-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 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">31 pages, 34 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/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/physics?searchtype=author&query=Aalseth%2C+C+E">C. E. Aalseth</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Aguayo%2C+E">E. Aguayo</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Amman%2C+M">M. Amman</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Back%2C+H+O">H. O. Back</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barbeau%2C+P+S">P. S. Barbeau</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bos%2C+B">B. Bos</a>, <a href="/search/physics?searchtype=author&query=Boswell%2C+M">M. Boswell</a>, <a href="/search/physics?searchtype=author&query=Brodzinski%2C+R+L">R. L. Brodzinski</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A+S">A. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?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/1710.07776">arXiv:1710.07776</a> <span> [<a href="https://arxiv.org/pdf/1710.07776">pdf</a>, <a href="https://arxiv.org/format/1710.07776">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> <p class="title is-5 mathjax"> Searching for neutrinoless double beta decay with GERDA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=GERDA+Collaboration"> GERDA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/physics?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/physics?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/physics?searchtype=author&query=Egorov%2C+V">V. Egorov</a>, <a href="/search/physics?searchtype=author&query=Falkenstein%2C+R">R. Falkenstein</a>, <a href="/search/physics?searchtype=author&query=Gangapshev%2C+A">A. Gangapshev</a> , et al. (81 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="1710.07776v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) experiment located at the INFN Gran Sasso Laboratory (Italy), is looking for the neutrinoless double beta decay of Ge76, by using high-purity germanium detectors made from isotopically enriched material. The combination of the novel experimental design, the careful material selection for radio-purity and the active/passive shielding techniques result in a very… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.07776v1-abstract-full').style.display = 'inline'; document.getElementById('1710.07776v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.07776v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) experiment located at the INFN Gran Sasso Laboratory (Italy), is looking for the neutrinoless double beta decay of Ge76, by using high-purity germanium detectors made from isotopically enriched material. The combination of the novel experimental design, the careful material selection for radio-purity and the active/passive shielding techniques result in a very low residual background at the Q-value of the decay, about 1e-3 counts/(keV kg yr). This makes GERDA the first experiment in the field to be background-free for the complete design exposure of 100 kg yr. A search for neutrinoless double beta decay was performed with a total exposure of 47.7 kg yr: 23.2 kg yr come from the second phase (Phase II) of the experiment, in which the background is reduced by about a factor of ten with respect to the previous phase. The analysis presented in this paper includes 12.4 kg yr of new Phase II data. No evidence for a possible signal is found: the lower limit for the half-life of Ge76 is 8.0e25 yr at 90% CL. The experimental median sensitivity is 5.8e25 yr. The experiment is currently taking data. As it is running in a background-free regime, its sensitivity grows linearly with exposure and it is expected to surpass 1e26 yr within 2018. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.07776v1-abstract-full').style.display = 'none'; document.getElementById('1710.07776v1-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 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">8 pages, to appear in the proceedings of TAUP2017</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys., Conf. Ser. 1342 (2020) 012005 </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/physics?searchtype=author&query=LEGEND+Collaboration"> LEGEND Collaboration</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Abramov%2C+A">A. Abramov</a>, <a href="/search/physics?searchtype=author&query=Abrosimov%2C+N">N. Abrosimov</a>, <a href="/search/physics?searchtype=author&query=Abt%2C+I">I. Abt</a>, <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Agartioglu%2C+M">M. Agartioglu</a>, <a href="/search/physics?searchtype=author&query=Ajjaq%2C+A">A. Ajjaq</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bolozdynya%2C+A">A. Bolozdynya</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Boston%2C+A">A. Boston</a>, <a href="/search/physics?searchtype=author&query=Boston%2C+H">H. Boston</a>, <a href="/search/physics?searchtype=author&query=Boyd%2C+S+T+P">S. T. P. Boyd</a>, <a href="/search/physics?searchtype=author&query=Breier%2C+R">R. Breier</a>, <a href="/search/physics?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/physics?searchtype=author&query=Guiseppe%2C+V+E">V. E. Guiseppe</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/physics?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/physics?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/physics?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/physics?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/physics?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/physics?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Chan%2C+Y">Y-D. Chan</a>, <a href="/search/physics?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/physics?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/physics?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/physics?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/physics?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/physics?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/physics?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/physics?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/1703.00570">arXiv:1703.00570</a> <span> [<a href="https://arxiv.org/pdf/1703.00570">pdf</a>, <a href="https://arxiv.org/format/1703.00570">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/10.1038/nature21717">10.1038/nature21717 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Background free search for neutrinoless double beta decay with GERDA Phase II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=DiMarco%2C+N">N. DiMarco</a>, <a href="/search/physics?searchtype=author&query=diVacri%2C+A">A. diVacri</a>, <a href="/search/physics?searchtype=author&query=Domula%2C+A">A. Domula</a> , et al. (91 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="1703.00570v2-abstract-short" style="display: inline;"> The Standard Model of particle physics cannot explain the dominance of matter over anti-matter in our Universe. In many model extensions this is a very natural consequence of neutrinos being their own anti-particles (Majorana particles) which implies that a lepton number violating radioactive decay named neutrinoless double beta ($0谓尾尾$) decay should exist. The detection of this extremely rare hyp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.00570v2-abstract-full').style.display = 'inline'; document.getElementById('1703.00570v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.00570v2-abstract-full" style="display: none;"> The Standard Model of particle physics cannot explain the dominance of matter over anti-matter in our Universe. In many model extensions this is a very natural consequence of neutrinos being their own anti-particles (Majorana particles) which implies that a lepton number violating radioactive decay named neutrinoless double beta ($0谓尾尾$) decay should exist. The detection of this extremely rare hypothetical process requires utmost suppression of any kind of backgrounds. The GERDA collaboration searches for $0谓尾尾$ decay of $^{76}$Ge ($^{76}\rm{Ge} \rightarrow\,^{76}\rm{Se} + 2e^-$) by operating bare detectors made from germanium with enriched $^{76}$Ge fraction in liquid argon. Here, we report on first data of GERDA Phase II. A background level of $\approx10^{-3}$ cts/(keV$\cdot$kg$\cdot$yr) has been achieved which is the world-best if weighted by the narrow energy-signal region of germanium detectors. Combining Phase I and II data we find no signal and deduce a new lower limit for the half-life of $5.3\cdot10^{25}$ yr at 90 % C.L. Our sensitivity of $4.0\cdot10^{25}$ yr is competitive with the one of experiments with significantly larger isotope mass. GERDA is the first $0谓尾尾$ experiment that will be background-free up to its design exposure. This progress relies on a novel active veto system, the superior germanium detector energy resolution and the improved background recognition of our new detectors. The unique discovery potential of an essentially background-free search for $0谓尾尾$ decay motivates a larger germanium experiment with higher sensitivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.00570v2-abstract-full').style.display = 'none'; document.getElementById('1703.00570v2-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 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">14 pages, 9 figures, 1 table; ; data, figures and images available at http://www.mpi-hd.mpg/gerda/public</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature, Volume 544, Number 7648, pp5-132 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.06884">arXiv:1611.06884</a> <span> [<a href="https://arxiv.org/pdf/1611.06884">pdf</a>, <a href="https://arxiv.org/format/1611.06884">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.2017.03.003">10.1016/j.astropartphys.2017.03.003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limits on uranium and thorium bulk content in GERDA Phase I detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=GERDA+collaboration"> GERDA collaboration</a>, <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=di+Vacri%2C+A">A. di Vacri</a> , et al. (91 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="1611.06884v1-abstract-short" style="display: inline;"> Internal contaminations of $^{238}$U, $^{235}$U and $^{232}$Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of $^{76}$Ge. The data from GERDA Phase~I have been analyzed for alpha events from the decay chain of these contaminations by looking for full decay chains and for time correlations between successive de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.06884v1-abstract-full').style.display = 'inline'; document.getElementById('1611.06884v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.06884v1-abstract-full" style="display: none;"> Internal contaminations of $^{238}$U, $^{235}$U and $^{232}$Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of $^{76}$Ge. The data from GERDA Phase~I have been analyzed for alpha events from the decay chain of these contaminations by looking for full decay chains and for time correlations between successive decays in the same detector. No candidate events for a full chain have been found. Upper limits on the activities in the range of a few nBq/kg for $^{226}$Ra, $^{227}$Ac and $^{228}$Th, the long-lived daughter nuclides of $^{238}$U, $^{235}$U and $^{232}$Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from $^{226}$Ra and $^{228}$Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.06884v1-abstract-full').style.display = 'none'; document.getElementById('1611.06884v1-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 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">2 figures, 7 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.03158">arXiv:1608.03158</a> <span> [<a href="https://arxiv.org/pdf/1608.03158">pdf</a>, <a href="https://arxiv.org/format/1608.03158">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 - 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/10.1016/j.nima.2016.12.015">10.1016/j.nima.2016.12.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Impact of ADC non-linearities on the sensitivity to sterile keV neutrinos with a KATRIN-like experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dolde%2C+K">K. Dolde</a>, <a href="/search/physics?searchtype=author&query=Mertens%2C+S">S. Mertens</a>, <a href="/search/physics?searchtype=author&query=Radford%2C+D">D. Radford</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+A">A. Huber</a>, <a href="/search/physics?searchtype=author&query=Korzeczek%2C+M">M. Korzeczek</a>, <a href="/search/physics?searchtype=author&query=Lasserre%2C+T">T. Lasserre</a>, <a href="/search/physics?searchtype=author&query=Slezak%2C+M">M. Slezak</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="1608.03158v1-abstract-short" style="display: inline;"> ADC non-linearities are a major systematic effect in the search for keV-scale sterile neutrinos with tritium $尾$-decay experiments like KATRIN. They can significantly distort the spectral shape and thereby obscure the tiny kink-like signature of a sterile neutrino. In this work we demonstrate various mitigation techniques to reduce the impact of ADC non-linearities on the tritium $尾$-decay spectru… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.03158v1-abstract-full').style.display = 'inline'; document.getElementById('1608.03158v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.03158v1-abstract-full" style="display: none;"> ADC non-linearities are a major systematic effect in the search for keV-scale sterile neutrinos with tritium $尾$-decay experiments like KATRIN. They can significantly distort the spectral shape and thereby obscure the tiny kink-like signature of a sterile neutrino. In this work we demonstrate various mitigation techniques to reduce the impact of ADC non-linearities on the tritium $尾$-decay spectrum to a level of $<$ ppm. The best results are achieved with a multi-pixel ($\geq10^4$ pixels) detector using full waveform digitization. In this case, active-to-sterile mixing angles of the order of $\sin^2 胃= 10^{-7}$ would be accessible from the viewpoint of ADC non-linearities. With purely peak-sensing ADCs a comparable sensitivity could be reached with highly linear ADCs, sufficient non-linearity corrections or by increasing the number of pixels to $\geq 10^5$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.03158v1-abstract-full').style.display = 'none'; document.getElementById('1608.03158v1-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 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">20 pages, 14 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/1606.04254">arXiv:1606.04254</a> <span> [<a href="https://arxiv.org/pdf/1606.04254">pdf</a>, <a href="https://arxiv.org/format/1606.04254">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> </div> </div> <p class="title is-5 mathjax"> Optical fiber read-out for liquid argon scintillation light </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cs%C3%A1thy%2C+J+J">J. Janicsk贸 Cs谩thy</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Kratz%2C+J">J. Kratz</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%B6nert%2C+S">S. Sch枚nert</a>, <a href="/search/physics?searchtype=author&query=Wiesinger%2C+C">Ch. Wiesinger</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="1606.04254v1-abstract-short" style="display: inline;"> In this paper we describe the performance of a light detector for Ar scintillation light made of wavelength-shifting (WLS) fibers connected to Silicon-Photomultipliers (SiPM). The setup was conceived to be used as anti-Compton veto for high purity germanium (HPGe) detectors operated directly in liquid Argon (LAr). Background suppression efficiencies for different radioactive sources were measured… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.04254v1-abstract-full').style.display = 'inline'; document.getElementById('1606.04254v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.04254v1-abstract-full" style="display: none;"> In this paper we describe the performance of a light detector for Ar scintillation light made of wavelength-shifting (WLS) fibers connected to Silicon-Photomultipliers (SiPM). The setup was conceived to be used as anti-Compton veto for high purity germanium (HPGe) detectors operated directly in liquid Argon (LAr). Background suppression efficiencies for different radioactive sources were measured in a test cryostat with about 800 kg LAr. This work was part of the R\&D effort for the GERDA experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.04254v1-abstract-full').style.display = 'none'; document.getElementById('1606.04254v1-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">14 pages, 11 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/1601.06007">arXiv:1601.06007</a> <span> [<a href="https://arxiv.org/pdf/1601.06007">pdf</a>, <a href="https://arxiv.org/format/1601.06007">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> </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.2016.08.002">10.1016/j.astropartphys.2016.08.002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Flux Modulations seen by the Muon Veto of the GERDA Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/physics?searchtype=author&query=di+Vacri%2C+A">A. di Vacri</a> , et al. (90 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="1601.06007v1-abstract-short" style="display: inline;"> The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66~PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two effects have been identified which are caused by secondary muons from the CNGS neutrino beam (2.2 %) and a temperature modulation of the at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06007v1-abstract-full').style.display = 'inline'; document.getElementById('1601.06007v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.06007v1-abstract-full" style="display: none;"> The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66~PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two effects have been identified which are caused by secondary muons from the CNGS neutrino beam (2.2 %) and a temperature modulation of the atmosphere (1.4 %). A mean cosmic muon rate of $I^0_渭 = (3.477 \pm 0.002_{\textrm{stat}} \pm 0.067_{\textrm{sys}}) \times 10^{-4}$/(s$\cdot$m$^2$) was found in good agreement with other experiments at LNGS at a depth of 3500~meter water equivalent. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06007v1-abstract-full').style.display = 'none'; document.getElementById('1601.06007v1-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 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">7 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Astrop. Phys., 84 (2016) 29 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.04392">arXiv:1502.04392</a> <span> [<a href="https://arxiv.org/pdf/1502.04392">pdf</a>, <a href="https://arxiv.org/format/1502.04392">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"> Improvement of the Energy Resolution via an Optimized Digital Signal Processing in GERDA Phase I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a> , et al. (89 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="1502.04392v1-abstract-short" style="display: inline;"> An optimized digital shaping filter has been developed for the GERDA experiment which searches for neutrinoless double beta decay in 76Ge. The GERDA Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) at the 76Ge Q value for 0谓尾尾decay is obtained. This is possible thanks to the enhanced low-frequency noise rejection of this Zero A… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.04392v1-abstract-full').style.display = 'inline'; document.getElementById('1502.04392v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.04392v1-abstract-full" style="display: none;"> An optimized digital shaping filter has been developed for the GERDA experiment which searches for neutrinoless double beta decay in 76Ge. The GERDA Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) at the 76Ge Q value for 0谓尾尾decay is obtained. This is possible thanks to the enhanced low-frequency noise rejection of this Zero Area Cusp (ZAC) signal shaping fillter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.04392v1-abstract-full').style.display = 'none'; document.getElementById('1502.04392v1-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> 15 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2015. </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">12 pages, 16 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 75 (2015) 255 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.02345">arXiv:1501.02345</a> <span> [<a href="https://arxiv.org/pdf/1501.02345">pdf</a>, <a href="https://arxiv.org/format/1501.02345">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/s10052-015-3627-y">10.1140/epjc/s10052-015-3627-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Results on $尾尾$ decay with emission of two neutrinos or Majorons in $^{76}$Ge from GERDA Phase I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/physics?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a> , et al. (87 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="1501.02345v1-abstract-short" style="display: inline;"> A search for neutrinoless $尾尾$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10$^{23}$ yr on their half-lives… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.02345v1-abstract-full').style.display = 'inline'; document.getElementById('1501.02345v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.02345v1-abstract-full" style="display: none;"> A search for neutrinoless $尾尾$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10$^{23}$ yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with $^{76}$Ge. A new result for the half-life of the neutrino-accompanied $尾尾$ decay of $^{76}$Ge with significantly reduced uncertainties is also given, resulting in $T^{2谓}_{1/2} = (1.926 \pm 0.095)\cdot10^{21}$ yr. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.02345v1-abstract-full').style.display = 'none'; document.getElementById('1501.02345v1-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 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </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 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 75 (2015) 416 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1410.0853">arXiv:1410.0853</a> <span> [<a href="https://arxiv.org/pdf/1410.0853">pdf</a>, <a href="https://arxiv.org/format/1410.0853">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/s10052-014-3253-0">10.1140/epjc/s10052-014-3253-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Production, characterization and operation of $^{76}$Ge enriched BEGe detectors in GERDA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budjas%2C+D">D. Budjas</a>, <a href="/search/physics?searchtype=author&query=Caldwel%2C+A">A. Caldwel</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a> , et al. (87 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="1410.0853v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0谓尾尾) of $^{76}$Ge. Germanium detectors made of material with an enriched $^{76}$Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of the experiment mainly refurbished semi-coaxial Ge detectors from former experiments were used… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.0853v1-abstract-full').style.display = 'inline'; document.getElementById('1410.0853v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1410.0853v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0谓尾尾) of $^{76}$Ge. Germanium detectors made of material with an enriched $^{76}$Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of the experiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new $^{76}$Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in GERDA during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the $^{76}$Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of GERDA Phase~II. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.0853v1-abstract-full').style.display = 'none'; document.getElementById('1410.0853v1-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2014. </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, 21 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 75 (2015) 39 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1307.2610">arXiv:1307.2610</a> <span> [<a href="https://arxiv.org/pdf/1307.2610">pdf</a>, <a href="https://arxiv.org/format/1307.2610">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/10.1140/epjc/s10052-013-2583-7">10.1140/epjc/s10052-013-2583-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pulse shape discrimination for GERDA Phase I data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Heider%2C+M+B">M. Barnabe Heider</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/physics?searchtype=author&query=Cossavella%2C+F">F. Cossavella</a> , et al. (89 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="1307.2610v1-abstract-short" style="display: inline;"> The GERDA experiment located at the LNGS searches for neutrinoless double beta (0谓尾尾) decay of ^{76}Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched ^{76}Ge fraction. The experiment… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.2610v1-abstract-full').style.display = 'inline'; document.getElementById('1307.2610v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1307.2610v1-abstract-full" style="display: none;"> The GERDA experiment located at the LNGS searches for neutrinoless double beta (0谓尾尾) decay of ^{76}Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched ^{76}Ge fraction. The experimental sensitivity can be improved by analyzing the pulse shape of the detector signals with the aim to reject background events. This paper documents the algorithms developed before the data of Phase I were unblinded. The double escape peak (DEP) and Compton edge events of 2.615 MeV 纬 rays from ^{208}Tl decays as well as 2谓尾尾 decays of ^{76}Ge are used as proxies for 0谓尾尾 decay. For BEGe detectors the chosen selection is based on a single pulse shape parameter. It accepts 0.92$\pm$0.02 of signal-like events while about 80% of the background events at Q_{尾尾}=2039 keV are rejected. For semi-coaxial detectors three analyses are developed. The one based on an artificial neural network is used for the search of 0谓尾尾 decay. It retains 90% of DEP events and rejects about half of the events around Q_{尾尾}. The 2谓尾尾 events have an efficiency of 0.85\pm0.02 and the one for 0谓尾尾 decays is estimated to be 0.90^{+0.05}_{-0.09}. A second analysis uses a likelihood approach trained on Compton edge events. The third approach uses two pulse shape parameters. The latter two methods confirm the classification of the neural network since about 90% of the data events rejected by the neural network are also removed by both of them. In general, the selection efficiency extracted from DEP events agrees well with those determined from Compton edge events or from 2谓尾尾 decays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.2610v1-abstract-full').style.display = 'none'; document.getElementById('1307.2610v1-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 July, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2013. </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">18 pages, 27 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 73 (2013) 2583 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.5084">arXiv:1306.5084</a> <span> [<a href="https://arxiv.org/pdf/1306.5084">pdf</a>, <a href="https://arxiv.org/format/1306.5084">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> </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/s10052-014-2764-z">10.1140/epjc/s10052-014-2764-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The background in the neutrinoless double beta decay experiment GERDA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+GERDA+collaboration"> The GERDA collaboration</a>, <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Heider%2C+M+B">M. Barnabe Heider</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budjas%2C+D">D. Budjas</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/physics?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/physics?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a> , et al. (89 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="1306.5084v2-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta decay of 76Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Q-value of the decay, Q_bb. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5084v2-abstract-full').style.display = 'inline'; document.getElementById('1306.5084v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.5084v2-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta decay of 76Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Q-value of the decay, Q_bb. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Q_bb. The main parameters needed for the neutrinoless double beta decay analysis are described. A background model was developed to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Q_bb with a background index ranging from 17.6 to 23.8*10^{-3} counts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Q-bb is dominated by close sources, mainly due to 42K, 214Bi, 228Th, 60Co and alpha emitting isotopes from the 226Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known gamma peaks, the energy spectrum can be fitted in an energy range of 200 kev around Q_bb with a constant background. This gives a background index consistent with the full model and uncertainties of the same size. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5084v2-abstract-full').style.display = 'none'; document.getElementById('1306.5084v2-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 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 74 (2014) 2764 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1212.4067">arXiv:1212.4067</a> <span> [<a href="https://arxiv.org/pdf/1212.4067">pdf</a>, <a href="https://arxiv.org/format/1212.4067">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/s10052-013-2330-0">10.1140/epjc/s10052-013-2330-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The GERDA experiment for the search of 0谓尾尾 decay in ^{76}Ge </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=GERDA+Collaboration"> GERDA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Ackermann%2C+K+-">K. -H. Ackermann</a>, <a href="/search/physics?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/physics?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/physics?searchtype=author&query=Altmann%2C+M">M. Altmann</a>, <a href="/search/physics?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/physics?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/physics?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/physics?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/physics?searchtype=author&query=Heider%2C+M+B">M. Barnabe Heider</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/physics?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/physics?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/physics?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/physics?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/physics?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/physics?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/physics?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/physics?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/physics?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/physics?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/physics?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/physics?searchtype=author&query=Budjas%2C+D">D. Budjas</a>, <a href="/search/physics?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a> , et al. (114 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="1212.4067v1-abstract-short" style="display: inline;"> The GERDA collaboration is performing a search for neutrinoless double beta decay of ^{76}Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1212.4067v1-abstract-full" style="display: none;"> The GERDA collaboration is performing a search for neutrinoless double beta decay of ^{76}Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.4067v1-abstract-full').style.display = 'none'; document.getElementById('1212.4067v1-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> 17 December, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2012. </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">31 pages, 23 figures, submitted to EPJC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 73 (2013) 2330 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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