Search | arXiv e-print repository

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"/> <meta name="viewport" content="width=device-width, initial-scale=1"/>  <link rel="apple-touch-icon" sizes="180x180" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon-16x16.png"> <link rel="manifest" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/site.webmanifest"> <link rel="mask-icon" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/safari-pinned-tab.svg" color="#b31b1b"> <link rel="shortcut icon" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon.ico"> <meta name="msapplication-TileColor" content="#b31b1b"> <meta name="msapplication-config" content="images/icons/browserconfig.xml"> <meta name="theme-color" content="#b31b1b">  <title>Search | arXiv e-print repository</title> <script defer src="https://static.arxiv.org/static/base/1.0.0a5/fontawesome-free-5.11.2-web/js/all.js"></script> <link rel="stylesheet" href="https://static.arxiv.org/static/base/1.0.0a5/css/arxivstyle.css" /> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ messageStyle: "none", extensions: ["tex2jax.js"], jax: ["input/TeX", "output/HTML-CSS"], tex2jax: { inlineMath: [ ['$','$'], ["\$","\$"] ], displayMath: [ ['$$','$$'], ["\\[","\\]"] ], processEscapes: true, ignoreClass: '.*', processClass: 'mathjax.*' }, TeX: { extensions: ["AMSmath.js", "AMSsymbols.js", "noErrors.js"], noErrors: { inlineDelimiters: ["$","$"], multiLine: false, style: { "font-size": "normal", "border": "" } } }, "HTML-CSS": { availableFonts: ["TeX"] } }); </script> <script src='//static.arxiv.org/MathJax-2.7.3/MathJax.js'></script> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/notification.js"></script> <link rel="stylesheet" href="https://static.arxiv.org/static/search/0.5.6/css/bulma-tooltip.min.css" /> <link rel="stylesheet" href="https://static.arxiv.org/static/search/0.5.6/css/search.css" /> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha256-k2WSCIexGzOj3Euiig+TlR8gA0EmPjuc79OEeY5L45g=" crossorigin="anonymous"></script> <script src="https://static.arxiv.org/static/search/0.5.6/js/fieldset.js"></script> <style> radio#cf-customfield_11400 { display: none; } </style> </head> <body> <header><a href="#main-container" class="is-sr-only">Skip to main content</a>  <div class="attribution level is-marginless" role="banner"> <div class="level-left"> <a class="level-item" href="https://cornell.edu/"><img src="https://static.arxiv.org/static/base/1.0.0a5/images/cornell-reduced-white-SMALL.svg" alt="Cornell University" width="200" aria-label="logo" /></a> </div> <div class="level-right is-marginless"><p class="sponsors level-item is-marginless"><span id="support-ack-url">We gratefully acknowledge support from<br /> the Simons Foundation, <a href="https://info.arxiv.org/about/ourmembers.html">member institutions</a>, and all contributors. <a href="https://info.arxiv.org/about/donate.html">Donate</a></span></p></div> </div>  <div class="identity level is-marginless"> <div class="level-left"> <div class="level-item"> <a class="arxiv" href="https://arxiv.org/" aria-label="arxiv-logo"> <img src="https://static.arxiv.org/static/base/1.0.0a5/images/arxiv-logo-one-color-white.svg" aria-label="logo" alt="arxiv logo" width="85" style="width:85px;"/> </a> </div> </div> <div class="search-block level-right"> <form class="level-item mini-search" method="GET" action="https://arxiv.org/search"> <div class="field has-addons"> <div class="control"> <input class="input is-small" type="text" name="query" placeholder="Search..." aria-label="Search term or terms" /> <p class="help"><a href="https://info.arxiv.org/help">Help</a> | <a href="https://arxiv.org/search/advanced">Advanced Search</a></p> </div> <div class="control"> <div class="select is-small"> <select name="searchtype" aria-label="Field to search"> <option value="all" selected="selected">All fields</option> <option value="title">Title</option> <option value="author">Author</option> <option value="abstract">Abstract</option> <option value="comments">Comments</option> <option value="journal_ref">Journal reference</option> <option value="acm_class">ACM classification</option> <option value="msc_class">MSC classification</option> <option value="report_num">Report number</option> <option value="paper_id">arXiv identifier</option> <option value="doi">DOI</option> <option value="orcid">ORCID</option> <option value="author_id">arXiv author ID</option> <option value="help">Help pages</option> <option value="full_text">Full text</option> </select> </div> </div> <input type="hidden" name="source" value="header"> <button class="button is-small is-cul-darker">Search</button> </div> </form> </div> </div>  <div class="container"> <div class="user-tools is-size-7 has-text-right has-text-weight-bold" role="navigation" aria-label="User menu"> <a href="https://arxiv.org/login">Login</a> </div> </div> </header> <main class="container" id="main-container"> <div class="level is-marginless"> <div class="level-left"> <h1 class="title is-clearfix"> Showing 1–21 of 21 results for author: <span class="mathjax">Domula, A</span> </h1> </div> <div class="level-right is-hidden-mobile">  <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> <div class="content"> <form method="GET" action="/search/nucl-ex" aria-role="search"> Searching in archive <strong>nucl-ex</strong>. <a href="/search/?searchtype=author&query=Domula%2C+A">Search in all archives.</a> <div class="field has-addons-tablet"> <div class="control is-expanded"> <label for="query" class="hidden-label">Search term or terms</label> <input class="input is-medium" id="query" name="query" placeholder="Search term..." type="text" value="Domula, A"> </div> <div class="select control is-medium"> <label class="is-hidden" for="searchtype">Field</label> <select class="is-medium" id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> </div> <div class="control"> <button class="button is-link is-medium">Search</button> </div> </div> <div class="field"> <div class="control is-size-7"> <label class="radio"> <input checked id="abstracts-0" name="abstracts" type="radio" value="show"> Show abstracts </label> <label class="radio"> <input id="abstracts-1" name="abstracts" type="radio" value="hide"> Hide abstracts </label> </div> </div> <div class="is-clearfix" style="height: 2.5em"> <div class="is-pulled-right"> <a href="/search/advanced?terms-0-term=Domula%2C+A&terms-0-field=author&size=50&order=-announced_date_first">Advanced Search</a> </div> </div> <input type="hidden" name="order" value="-announced_date_first"> <input type="hidden" name="size" value="50"> </form> <div class="level breathe-horizontal"> <div class="level-left"> <form method="GET" action="/search/"> <div style="display: none;"> <select id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> <input id="query" name="query" type="text" value="Domula, A"> <ul id="abstracts"><li><input checked id="abstracts-0" name="abstracts" type="radio" value="show"> <label for="abstracts-0">Show abstracts</label></li><li><input id="abstracts-1" name="abstracts" type="radio" value="hide"> <label for="abstracts-1">Hide abstracts</label></li></ul> </div> <div class="box field is-grouped is-grouped-multiline level-item"> <div class="control"> <span class="select is-small"> <select id="size" name="size"><option value="25">25</option><option selected value="50">50</option><option value="100">100</option><option value="200">200</option></select> </span> <label for="size">results per page</label>. </div> <div class="control"> <label for="order">Sort results by</label> <span class="select is-small"> <select id="order" name="order"><option selected value="-announced_date_first">Announcement date (newest first)</option><option value="announced_date_first">Announcement date (oldest first)</option><option value="-submitted_date">Submission date (newest first)</option><option value="submitted_date">Submission date (oldest first)</option><option value="">Relevance</option></select> </span> </div> <div class="control"> <button class="button is-small 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/1909.02726">arXiv:1909.02726</a> <span> [<a href="https://arxiv.org/pdf/1909.02726">pdf</a>, <a href="https://arxiv.org/format/1909.02726">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/science.aav8613">10.1126/science.aav8613 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing Majorana neutrinos with double-$尾$ decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=GERDA+collaboration"> GERDA collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Comellato%2C+T">T. Comellato</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/nucl-ex?searchtype=author&query=Egorov%2C+V">V. Egorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Falkenstein%2C+R">R. Falkenstein</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="1909.02726v1-abstract-short" style="display: inline;"> A discovery that neutrinos are not the usual Dirac but Majorana fermions, i.e. identical to their antiparticles, would be a manifestation of new physics with profound implications for particle physics and cosmology. Majorana neutrinos would generate neutrinoless double-$尾$ ($0谓尾尾$) decay, a matter-creating process without the balancing emission of antimatter. So far, 0$谓尾尾$ decay has eluded detect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.02726v1-abstract-full').style.display = 'inline'; document.getElementById('1909.02726v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.02726v1-abstract-full" style="display: none;"> A discovery that neutrinos are not the usual Dirac but Majorana fermions, i.e. identical to their antiparticles, would be a manifestation of new physics with profound implications for particle physics and cosmology. Majorana neutrinos would generate neutrinoless double-$尾$ ($0谓尾尾$) decay, a matter-creating process without the balancing emission of antimatter. So far, 0$谓尾尾$ decay has eluded detection. The GERDA collaboration searches for the $0谓尾尾$ decay of $^{76}$Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg$\cdot$yr, we observe no signal and derive a lower half-life limit of T$_{1/2}$ > 0.9$\cdot$10$^{26}$ yr (90% C.L.). Our T$_{1/2}$ sensitivity assuming no signal is 1.1$\cdot$10$^{26}$ yr. Combining the latter with those from other $0谓尾尾$ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 - 0.16 eV, with corresponding sensitivities to the absolute mass scale in $尾$ decay of 0.15 - 0.44 eV, and to the cosmological relevant sum of neutrino masses of 0.46 - 1.3 eV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.02726v1-abstract-full').style.display = 'none'; document.getElementById('1909.02726v1-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, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Authors' main+supplementary text: 13+28 pages, 3+12 figures, 1+7 tables. Definite version to be published in Science</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 365, 1445 (2019); published online 05 Sep 2019 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.02522">arXiv:1909.02522</a> <span> [<a href="https://arxiv.org/pdf/1909.02522">pdf</a>, <a href="https://arxiv.org/format/1909.02522">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/10.1007/JHEP03(2020)139">10.1007/JHEP03(2020)139 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Modeling of GERDA Phase II data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=GERDA+collaboration"> GERDA collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">Matteo Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">Alexander M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">Marco Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">Igor Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">Laura Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">Christian Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">Enrico Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">Sergej Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">Alessandro Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">Leonid Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">Dariusz Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">Elisabetta Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">Vikas Bothe</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">Victor Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">Riccardo Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">Allen Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">Carla Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">Andrey Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Comellato%2C+T">Tommaso Comellato</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">Valerio D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">Elena V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Marco%2C+N">Natalia Di Marco</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">Alexander Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Doroshkevich%2C+E">Evgenyi Doroshkevich</a> , et al. (85 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.02522v2-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 ($0谓尾尾$) decay of $^{76}$Ge. The technological challenge of GERDA is to operate in a "background-free" regime in the region of interest (ROI) after analysis cuts for the full 100$\,$kg$\cdot$yr target exposure of the experiment. A careful modeling and de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.02522v2-abstract-full').style.display = 'inline'; document.getElementById('1909.02522v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.02522v2-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 ($0谓尾尾$) decay of $^{76}$Ge. The technological challenge of GERDA is to operate in a "background-free" regime in the region of interest (ROI) after analysis cuts for the full 100$\,$kg$\cdot$yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around $Q_{尾尾}$ for the $0谓尾尾$ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos ($2谓尾尾$) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for GERDA Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of $16.04^{+0.78}_{-0.85} \cdot 10^{-3}\,$cts/(kg$\cdot$keV$\cdot$yr) for the enriched BEGe data set and $14.68^{+0.47}_{-0.52} \cdot 10^{-3}\,$cts/(kg$\cdot$keV$\cdot$yr) for the enriched coaxial data set. These values are similar to the one of Gerda Phase I despite a much larger number of detectors and hence radioactive hardware components. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.02522v2-abstract-full').style.display = 'none'; document.getElementById('1909.02522v2-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 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.08945">arXiv:1908.08945</a> <span> [<a href="https://arxiv.org/pdf/1908.08945">pdf</a>, <a href="https://arxiv.org/format/1908.08945">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/epja/i2019-12865-4">10.1140/epja/i2019-12865-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Background in $纬$-ray detectors and carbon beam tests in the Felsenkeller shallow-underground accelerator laboratory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Sz%C3%BCcs%2C+T">T. Sz眉cs</a>, <a href="/search/nucl-ex?searchtype=author&query=Bemmerer%2C+D">D. Bemmerer</a>, <a href="/search/nucl-ex?searchtype=author&query=Degering%2C+D">D. Degering</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Grieger%2C+M">M. Grieger</a>, <a href="/search/nucl-ex?searchtype=author&query=Ludwig%2C+F">F. Ludwig</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+K">K. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Steckling%2C+J">J. Steckling</a>, <a href="/search/nucl-ex?searchtype=author&query=Turkat%2C+S">S. Turkat</a>, <a href="/search/nucl-ex?searchtype=author&query=Zuber%2C+K">K. Zuber</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="1908.08945v1-abstract-short" style="display: inline;"> The relevant interaction energies for astrophysical radiative capture reactions are very low, much below the repulsive Coulomb barrier. This leads to low cross sections, low counting rates in $纬$-ray detectors, and therefore the need to perform such experiments at ion accelerators placed in underground settings, shielded from cosmic rays. Here, the feasibility of such experiments in the new shallo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.08945v1-abstract-full').style.display = 'inline'; document.getElementById('1908.08945v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.08945v1-abstract-full" style="display: none;"> The relevant interaction energies for astrophysical radiative capture reactions are very low, much below the repulsive Coulomb barrier. This leads to low cross sections, low counting rates in $纬$-ray detectors, and therefore the need to perform such experiments at ion accelerators placed in underground settings, shielded from cosmic rays. Here, the feasibility of such experiments in the new shallow-underground accelerator laboratory in tunnels VIII and IX of the Felsenkeller site in Dresden, Germany, is evaluated. To this end, the no-beam background in three different types of germanium detectors, i.e. a Euroball/Miniball triple cluster and two large monolithic detectors, is measured over periods of 26-66 days. The cosmic-ray induced background is found to be reduced by a factor of 500-2400, by the combined effects of, first, the 140 meters water equivalent overburden attenuating the cosmic muon flux by a factor of 40, and second, scintillation veto detectors gating out most of the remaining muon-induced effects. The new background data are compared to spectra taken with the same detectors at the Earth's surface and at other underground sites. Subsequently, the beam intensity from the cesium sputter ion source installed in Felsenkeller has been studied over periods of several hours. Based on the background and beam intensity data reported here, for the example of the $^{12}$C($伪$,$纬$)$^{16}$O reaction it is shown that highly sensitive experiments will be possible. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.08945v1-abstract-full').style.display = 'none'; document.getElementById('1908.08945v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">Submitted to Eur. Phys. J. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A 55, 174 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.08201">arXiv:1810.08201</a> <span> [<a href="https://arxiv.org/pdf/1810.08201">pdf</a>, <a href="https://arxiv.org/format/1810.08201">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/9789811204296_0015">10.1142/9789811204296_0015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The new Felsenkeller 5 MV underground accelerator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bemmerer%2C+D">Daniel Bemmerer</a>, <a href="/search/nucl-ex?searchtype=author&query=Cowan%2C+T+E">Thomas E. Cowan</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">Alexander Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=D%C3%B6ring%2C+T">Toralf D枚ring</a>, <a href="/search/nucl-ex?searchtype=author&query=Grieger%2C+M">Marcel Grieger</a>, <a href="/search/nucl-ex?searchtype=author&query=Hammer%2C+S">Sebastian Hammer</a>, <a href="/search/nucl-ex?searchtype=author&query=Hensel%2C+T">Thomas Hensel</a>, <a href="/search/nucl-ex?searchtype=author&query=H%C3%BCbinger%2C+L">Lisa H眉binger</a>, <a href="/search/nucl-ex?searchtype=author&query=Junghans%2C+A+R">Arnd R. Junghans</a>, <a href="/search/nucl-ex?searchtype=author&query=Ludwig%2C+F">Felix Ludwig</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+S+E">Stefan E. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Reinicke%2C+S">Stefan Reinicke</a>, <a href="/search/nucl-ex?searchtype=author&query=Rimarzig%2C+B">Bernd Rimarzig</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+K">Konrad Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Schwengner%2C+R">Ronald Schwengner</a>, <a href="/search/nucl-ex?searchtype=author&query=St%C3%B6ckel%2C+K">Klaus St枚ckel</a>, <a href="/search/nucl-ex?searchtype=author&query=Sz%C3%BCcs%2C+T">Tam谩s Sz眉cs</a>, <a href="/search/nucl-ex?searchtype=author&query=Turkat%2C+S">Steffen Turkat</a>, <a href="/search/nucl-ex?searchtype=author&query=Wagner%2C+A">Andreas Wagner</a>, <a href="/search/nucl-ex?searchtype=author&query=Wagner%2C+L">Louis Wagner</a>, <a href="/search/nucl-ex?searchtype=author&query=Zuber%2C+K">Kai Zuber</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="1810.08201v2-abstract-short" style="display: inline;"> The field of nuclear astrophysics is devoted to the study of the creation of the chemical elements. By nature, it is deeply intertwined with the physics of the Sun. The nuclear reactions of the proton-proton cycle of hydrogen burning, including the 3He(伪,纬)7Be reaction, provide the necessary nuclear energy to prevent the gravitational collapse of the Sun and give rise to the by now well-studied pp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.08201v2-abstract-full').style.display = 'inline'; document.getElementById('1810.08201v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.08201v2-abstract-full" style="display: none;"> The field of nuclear astrophysics is devoted to the study of the creation of the chemical elements. By nature, it is deeply intertwined with the physics of the Sun. The nuclear reactions of the proton-proton cycle of hydrogen burning, including the 3He(伪,纬)7Be reaction, provide the necessary nuclear energy to prevent the gravitational collapse of the Sun and give rise to the by now well-studied pp, 7Be, and 8B solar neutrinos. The not yet measured flux of 13N, 15O, and 17F neutrinos from the carbon-nitrogen-oxygen cycle is affected in rate by the 14N(p,纬)15O reaction and in emission profile by the 12C(p,纬)13N reaction. The nucleosynthetic output of the subsequent phase in stellar evolution, helium burning, is controlled by the 12C(伪,纬)16O reaction. In order to properly interpret the existing and upcoming solar neutrino data, precise nuclear physics information is needed. For nuclear reactions between light, stable nuclei, the best available technique are experiments with small ion accelerators in underground, low-background settings. The pioneering work in this regard has been done by the LUNA collaboration at Gran Sasso/Italy, using a 0.4 MV accelerator. The present contribution reports on a higher-energy, 5.0 MV, underground accelerator in the Felsenkeller underground site in Dresden/Germany. Results from 纬-ray, neutron, and muon background measurements in the Felsenkeller underground site in Dresden, Germany, show that the background conditions are satisfactory for nuclear astrophysics purposes. The accelerator is in the commissioning phase and will provide intense, up to 50渭A, beams of 1H+, 4He+ , and 12C+ ions, enabling research on astrophysically relevant nuclear reactions with unprecedented sensitivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.08201v2-abstract-full').style.display = 'none'; document.getElementById('1810.08201v2-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 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">Submitted to the Proceedings of the 5th International Solar Neutrino Conference, Dresden/Germany, 11-14 June 2018, to appear on World Scientific -- updated version (Figure 2 and relevant discussion updated, co-author A. Domula added)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.06178">arXiv:1804.06178</a> <span> [<a href="https://arxiv.org/pdf/1804.06178">pdf</a>, <a href="https://arxiv.org/format/1804.06178">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> First observation of the electron capture of $^{76}$As </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A+R">A. R. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Zuber%2C+K">K. Zuber</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="1804.06178v1-abstract-short" style="display: inline;"> For a variety of radionuclides which decay via $尾^{-}$ and a weak $尾^{+}$-channel the electron-capture (EC) is not observed yet. As the interest of exact decay characteristica increased again, not least with the need of reliable data for experiments on investigation of the neutrinoless double-beta-decay, an experiment for the investigation of the $^{76}$As-EC was performed. The first time observat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.06178v1-abstract-full').style.display = 'inline'; document.getElementById('1804.06178v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.06178v1-abstract-full" style="display: none;"> For a variety of radionuclides which decay via $尾^{-}$ and a weak $尾^{+}$-channel the electron-capture (EC) is not observed yet. As the interest of exact decay characteristica increased again, not least with the need of reliable data for experiments on investigation of the neutrinoless double-beta-decay, an experiment for the investigation of the $^{76}$As-EC was performed. The first time observation of the EC of $^{76}$As by this experiment resulted in a total branching-ratio for the EC / $尾^{+}$-channel of $p_\mathrm{EC} = 0.0269 \pm \left(0.0080(\mathrm{stat.}) \pm 0.0029(\mathrm{sys.}) \right)$ and $p_\mathrm{EC} = 0.0263 \pm \left(0.0077(\mathrm{stat.}) \pm 0.0047(\mathrm{sys.}) \right)$ according to two different methods. For the branching of this decay-channel into the first excited- and the ground state of \gess a limit was obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.06178v1-abstract-full').style.display = 'none'; document.getElementById('1804.06178v1-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 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">10 pages, 10 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/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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Biernat%2C+J">J. Biernat</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Comellato%2C+T">T. Comellato</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/nucl-ex?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/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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/nucl-ex?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/1711.01433">arXiv:1711.01433</a> <span> [<a href="https://arxiv.org/pdf/1711.01433">pdf</a>, <a href="https://arxiv.org/format/1711.01433">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2018.02.056">10.1016/j.nima.2018.02.056 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pulse shape discrimination performance of Inverted Coaxial Ge detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Hult%2C+M">M. Hult</a>, <a href="/search/nucl-ex?searchtype=author&query=Kermaidic%2C+Y">Y. Kermaidic</a>, <a href="/search/nucl-ex?searchtype=author&query=Marissens%2C+G">G. Marissens</a>, <a href="/search/nucl-ex?searchtype=author&query=Schwingenheuer%2C+B">B. Schwingenheuer</a>, <a href="/search/nucl-ex?searchtype=author&query=Wester%2C+T">T. Wester</a>, <a href="/search/nucl-ex?searchtype=author&query=Zuber%2C+K">K. Zuber</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="1711.01433v1-abstract-short" style="display: inline;"> We report on the characterization of two inverted coaxial Ge detectors in the context of being employed in future $^{76}$Ge neutrinoless double beta ($0谓尾尾$) decay experiments. It is an advantage that such detectors can be produced with bigger Ge mass as compared to the planar Broad Energy Ge detectors (BEGe) that are currently used in the GERDA $0谓尾尾$ decay experiment. This will result in lower b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01433v1-abstract-full').style.display = 'inline'; document.getElementById('1711.01433v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.01433v1-abstract-full" style="display: none;"> We report on the characterization of two inverted coaxial Ge detectors in the context of being employed in future $^{76}$Ge neutrinoless double beta ($0谓尾尾$) decay experiments. It is an advantage that such detectors can be produced with bigger Ge mass as compared to the planar Broad Energy Ge detectors (BEGe) that are currently used in the GERDA $0谓尾尾$ decay experiment. This will result in lower background for the search of $0谓尾尾$ decay due to a reduction of cables, electronics and holders. The measured resolution near the $^{76}$Ge Q-value at 2039 keV is 2.5 keV and their pulse-shape characteristics are similar to BEGe-detectors. It is concluded that this type of Ge-detector is suitable for usage in $^{76}$Ge $0谓尾尾$ decay experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.01433v1-abstract-full').style.display = 'none'; document.getElementById('1711.01433v1-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> </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/nucl-ex?searchtype=author&query=GERDA+Collaboration"> GERDA Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=Di+Marco%2C+N">N. Di Marco</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a>, <a href="/search/nucl-ex?searchtype=author&query=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/nucl-ex?searchtype=author&query=Egorov%2C+V">V. Egorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Falkenstein%2C+R">R. Falkenstein</a>, <a href="/search/nucl-ex?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/nucl-ex?searchtype=author&query=LEGEND+Collaboration"> LEGEND Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Abramov%2C+A">A. Abramov</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrosimov%2C+N">N. Abrosimov</a>, <a href="/search/nucl-ex?searchtype=author&query=Abt%2C+I">I. Abt</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Agartioglu%2C+M">M. Agartioglu</a>, <a href="/search/nucl-ex?searchtype=author&query=Ajjaq%2C+A">A. Ajjaq</a>, <a href="/search/nucl-ex?searchtype=author&query=Alvis%2C+S+I">S. I. Alvis</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Bolozdynya%2C+A">A. Bolozdynya</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Boston%2C+A">A. Boston</a>, <a href="/search/nucl-ex?searchtype=author&query=Boston%2C+H">H. Boston</a>, <a href="/search/nucl-ex?searchtype=author&query=Boyd%2C+S+T+P">S. T. P. Boyd</a>, <a href="/search/nucl-ex?searchtype=author&query=Breier%2C+R">R. Breier</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a> , et al. (208 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1709.01980v1-abstract-short" style="display: inline;"> The observation of neutrinoless double-beta decay (0$谓尾尾$) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.01980v1-abstract-full').style.display = 'inline'; document.getElementById('1709.01980v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.01980v1-abstract-full" style="display: none;"> The observation of neutrinoless double-beta decay (0$谓尾尾$) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of $\sim$0.1 count /(FWHM$\cdot$t$\cdot$yr) in the region of the signal. The current generation $^{76}$Ge experiments GERDA and the MAJORANA DEMONSTRATOR utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0$谓尾尾$ signal region of all 0$谓尾尾$ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale $^{76}$Ge experiment. The collaboration aims to develop a phased 0$谓尾尾$ experimental program with discovery potential at a half-life approaching or at $10^{28}$ years, using existing resources as appropriate to expedite physics results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.01980v1-abstract-full').style.display = 'none'; document.getElementById('1709.01980v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conference Proceedings 1894, 020027 (2017); </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=DiMarco%2C+N">N. DiMarco</a>, <a href="/search/nucl-ex?searchtype=author&query=diVacri%2C+A">A. diVacri</a>, <a href="/search/nucl-ex?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/nucl-ex?searchtype=author&query=GERDA+collaboration"> GERDA collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?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/1605.01756">arXiv:1605.01756</a> <span> [<a href="https://arxiv.org/pdf/1605.01756">pdf</a>, <a href="https://arxiv.org/format/1605.01756">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-016-4454-5">10.1140/epjc/s10052-016-4454-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limit on the Radiative Neutrinoless Double Electron Capture of $^{36}$Ar from GERDA Phase I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</a>, <a href="/search/nucl-ex?searchtype=author&query=di+Vacri%2C+A">A. di Vacri</a>, <a href="/search/nucl-ex?searchtype=author&query=Domula%2C+A">A. Domula</a> , et al. (93 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="1605.01756v2-abstract-short" style="display: inline;"> Neutrinoless double electron capture is a process that, if detected, would give evidence of lepton number violation and the Majorana nature of neutrinos. A search for neutrinoless double electron capture of $^{36}$Ar has been performed with germanium detectors installed in liquid argon using data from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory of INFN,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.01756v2-abstract-full').style.display = 'inline'; document.getElementById('1605.01756v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.01756v2-abstract-full" style="display: none;"> Neutrinoless double electron capture is a process that, if detected, would give evidence of lepton number violation and the Majorana nature of neutrinos. A search for neutrinoless double electron capture of $^{36}$Ar has been performed with germanium detectors installed in liquid argon using data from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory of INFN, Italy. No signal was observed and an experimental lower limit on the half-life of the radiative neutrinoless double electron capture of $^{36}$Ar was established: $T_{1/2} > $ 3.6 $\times$ 10$^{21}$ yr at 90 % C.I. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.01756v2-abstract-full').style.display = 'none'; document.getElementById('1605.01756v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 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 76 (2016) 652 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.03120">arXiv:1506.03120</a> <span> [<a href="https://arxiv.org/pdf/1506.03120">pdf</a>, <a href="https://arxiv.org/format/1506.03120">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0954-3899/42/11/115201">10.1088/0954-3899/42/11/115201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $2谓尾尾$ decay of $^{76}$Ge into excited states with GERDA Phase I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?searchtype=author&query=Demidova%2C+E+V">E. V. Demidova</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="1506.03120v1-abstract-short" style="display: inline;"> Two neutrino double beta decay of $^{76}$Ge to excited states of $^{76}$Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in $^{76}$Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.03120v1-abstract-full').style.display = 'inline'; document.getElementById('1506.03120v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.03120v1-abstract-full" style="display: none;"> Two neutrino double beta decay of $^{76}$Ge to excited states of $^{76}$Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in $^{76}$Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation $纬$ ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90\,\% C.L. bounds for three transitions: ${0^+_{\rm g.s.}-2^+_1}$: $T^{2谓}_{1/2}>$1.6$\cdot10^{23}$ yr, ${0^+_{\rm g.s.}-0^+_1}$: $T^{2谓}_{1/2}>$3.7$\cdot10^{23}$ yr and ${0^+_{\rm g.s.}-2^+_2}$: $T^{2谓}_{1/2}>$2.3$\cdot10^{23}$ yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90\,\% credibility bounds were extracted and used to exclude several models for the ${0^+_{\rm g.s.}-0^+_1}$ transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.03120v1-abstract-full').style.display = 'none'; document.getElementById('1506.03120v1-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 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. G: Nucl. Part. Phys. 42 (2015) 115201 </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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=D%27Andrea%2C+V">V. D'Andrea</a>, <a href="/search/nucl-ex?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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budjas%2C+D">D. Budjas</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwel%2C+A">A. Caldwel</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?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/1307.4720">arXiv:1307.4720</a> <span> [<a href="https://arxiv.org/pdf/1307.4720">pdf</a>, <a href="https://arxiv.org/format/1307.4720">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.111.122503">10.1103/PhysRevLett.111.122503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Results on neutrinoless double beta decay of 76Ge from GERDA Phase I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Heider%2C+M+B">M. Barnab茅 Heider</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Cossavella%2C+F">F. Cossavella</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="1307.4720v1-abstract-short" style="display: inline;"> Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.4720v1-abstract-full').style.display = 'inline'; document.getElementById('1307.4720v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1307.4720v1-abstract-full" style="display: none;"> Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kgyr. A blind analysis is performed. The background index is about 1.10^{-2} cts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of 76Ge, T_1/2 > 2.1 10^{25} yr (90% C.L.). The combination with the results from the previous experiments with 76Ge yields T_1/2 > 3.0 10^{25} yr (90% C.L.). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.4720v1-abstract-full').style.display = 'none'; document.getElementById('1307.4720v1-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 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">6 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 111 (2013) 122503 </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/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Heider%2C+M+B">M. Barnabe Heider</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budj%C3%A1%C5%A1%2C+D">D. Budj谩拧</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a>, <a href="/search/nucl-ex?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/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/nucl-ex?searchtype=author&query=GERDA+Collaboration"> GERDA Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Ackermann%2C+K+-">K. -H. Ackermann</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Altmann%2C+M">M. Altmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Heider%2C+M+B">M. Barnabe Heider</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budjas%2C+D">D. Budjas</a>, <a href="/search/nucl-ex?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> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1212.3210">arXiv:1212.3210</a> <span> [<a href="https://arxiv.org/pdf/1212.3210">pdf</a>, <a href="https://arxiv.org/format/1212.3210">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0954-3899/40/3/035110">10.1088/0954-3899/40/3/035110 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the half-life of the two-neutrino double beta decay of Ge-76 with the Gerda experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=GERDA+Collaboration"> GERDA Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Allardt%2C+M">M. Allardt</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreotti%2C+E">E. Andreotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A+M">A. M. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Heider%2C+M+B">M. Barnabe Heider</a>, <a href="/search/nucl-ex?searchtype=author&query=Barros%2C+N">N. Barros</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Becerici-Schmidt%2C+N">N. Becerici-Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Bellotti%2C+E">E. Bellotti</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belyaev%2C+S+T">S. T. Belyaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Benato%2C+G">G. Benato</a>, <a href="/search/nucl-ex?searchtype=author&query=Bettini%2C+A">A. Bettini</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bode%2C+T">T. Bode</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugnera%2C+R">R. Brugnera</a>, <a href="/search/nucl-ex?searchtype=author&query=Budjas%2C+D">D. Budjas</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+A">A. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Cattadori%2C+C">C. Cattadori</a>, <a href="/search/nucl-ex?searchtype=author&query=Chernogorov%2C+A">A. Chernogorov</a> , et al. (88 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="1212.3210v1-abstract-short" style="display: inline;"> The primary goal of the GERmanium Detector Array (Gerda) experiment at the Laboratori Nazionali del Gran Sasso of INFN is the search for the neutrinoless double beta decay of Ge-76. High-purity germanium detectors made from material enriched in Ge-76 are operated directly immersed in liquid argon, allowing for a substantial reduction of the background with respect to predecessor experiments. The f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.3210v1-abstract-full').style.display = 'inline'; document.getElementById('1212.3210v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1212.3210v1-abstract-full" style="display: none;"> The primary goal of the GERmanium Detector Array (Gerda) experiment at the Laboratori Nazionali del Gran Sasso of INFN is the search for the neutrinoless double beta decay of Ge-76. High-purity germanium detectors made from material enriched in Ge-76 are operated directly immersed in liquid argon, allowing for a substantial reduction of the background with respect to predecessor experiments. The first 5.04 kg yr of data collected in Phase I of the experiment have been analyzed to measure the half-life of the neutrino-accompanied double beta decay of Ge-76. The observed spectrum in the energy range between 600 and 1800 keV is dominated by the double beta decay of Ge-76. The half-life extracted from Gerda data is T(1/2) = (1.84 +0.14 -0.10) 10^{21} yr. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1212.3210v1-abstract-full').style.display = 'none'; document.getElementById('1212.3210v1-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, 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">14 pages, 2 figures, submitted to J. Phys. G: Nucl. Part. Phys</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. G: Nucl. Part. Phys. 40 (2013) 035110 </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>

CINXE.COM

Search | arXiv e-print repository