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</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/2405.15954">arXiv:2405.15954</a> <span> [<a href="https://arxiv.org/pdf/2405.15954">pdf</a>, <a href="https://arxiv.org/format/2405.15954">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Searches for new physics below twice the electron mass 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=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G+R">G. R. Araujo</a>, <a href="/search/nucl-ex?searchtype=author&query=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=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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Calgaro%2C+S">S. Calgaro</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=Chiu%2C+P+-">P. -J. Chiu</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> , et al. (86 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="2405.15954v1-abstract-short" style="display: inline;"> A search for full energy depositions from bosonic keV-scale dark matter candidates of masses between 65 keV and 1021 keV has been performed with data collected during Phase II of the GERmanium Detector Array (GERDA) experiment. Our analysis includes direct dark matter absorption as well as dark Compton scattering. With a total exposure of 105.5 kg yr, no evidence for a signal above the background… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.15954v1-abstract-full').style.display = 'inline'; document.getElementById('2405.15954v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.15954v1-abstract-full" style="display: none;"> A search for full energy depositions from bosonic keV-scale dark matter candidates of masses between 65 keV and 1021 keV has been performed with data collected during Phase II of the GERmanium Detector Array (GERDA) experiment. Our analysis includes direct dark matter absorption as well as dark Compton scattering. With a total exposure of 105.5 kg yr, no evidence for a signal above the background has been observed. The resulting exclusion limits deduced with either Bayesian or Frequentist statistics are the most stringent direct constraints in the major part of the 140-1021 keV mass range. As an example, at a mass of 150 keV the dimensionless coupling of dark photons and axion-like particles to electrons has been constrained to $伪$'/$伪$ < 8.7x10$^{-24}$ and g$_{ae}$ < 3.3x10$^{-12}$ at 90% credible interval (CI), respectively. Additionally, a search for peak-like signals from beyond the Standard Model decays of nucleons and electrons is performed. We find for the inclusive decay of a single neutron in $^{76}$Ge a lower lifetime limit of $蟿_n$ > 1.5x10$^{24}$ yr and for a proton $蟿_p$ > 1.3x10$^{24}$ yr at 90% CI. For the electron decay e$^-\rightarrow谓_e纬$ a lower limit of $蟿_e$ > 5.4x10$^{25}$ yr at 90% CI has been determined. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.15954v1-abstract-full').style.display = 'none'; document.getElementById('2405.15954v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 12 figures, 7 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.02214">arXiv:2311.02214</a> <span> [<a href="https://arxiv.org/pdf/2311.02214">pdf</a>, <a href="https://arxiv.org/format/2311.02214">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"> An improved limit on the neutrinoless double-electron capture of $^{36}$Ar 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=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G+R">G. R. Araujo</a>, <a href="/search/nucl-ex?searchtype=author&query=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=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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Doroshkevich%2C+E">E. Doroshkevich</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="2311.02214v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of $^{36}$Ar, a candidate isotope for the two-neutrino double-electron capture (2$谓$ECEC) and therefore for the neutrinoless double-electron capture (0$谓$ECEC). If detected, this process would give evidence of lepton number violation and the Majorana na… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.02214v1-abstract-full').style.display = 'inline'; document.getElementById('2311.02214v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.02214v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of $^{36}$Ar, a candidate isotope for the two-neutrino double-electron capture (2$谓$ECEC) and therefore for the neutrinoless double-electron capture (0$谓$ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0$谓$ECEC of $^{36}$Ar, a monochromatic photon is emitted with an energy of 429.88 keV, which may be detected by the GERDA germanium detectors. We searched for the $^{36}$Ar 0$谓$ECEC with GERDA data, with a total live time of 4.34 yr (3.08 yr accumulated during GERDA Phase II and 1.26 yr during GERDA Phase I). No signal was found and a 90% C.L. lower limit on the half-life of this process was established T$_{1/2}$ > 1.5x10$^{22}$ yr <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.02214v1-abstract-full').style.display = 'none'; document.getElementById('2311.02214v1-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 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 5 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.09795">arXiv:2308.09795</a> <span> [<a href="https://arxiv.org/pdf/2308.09795">pdf</a>, <a href="https://arxiv.org/format/2308.09795">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.131.142501">10.1103/PhysRevLett.131.142501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Final Results of GERDA on the Two-Neutrino Double-$尾$ Decay Half-Life of $^{76}$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=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G+R">G. R. Araujo</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=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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Calgaro%2C+S">S. Calgaro</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=Chiu%2C+P+-">P. -J. Chiu</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+Giacinto%2C+A">A. Di Giacinto</a> , et al. (94 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.09795v1-abstract-short" style="display: inline;"> We present the measurement of the two-neutrino double-$尾$ decay rate of $^{76}$Ge performed with the GERDA Phase II experiment. With a subset of the entire GERDA exposure, 11.8 kg$\cdot$yr, the half-life of the process has been determined: $T^{2谓}_{1/2} = (2.022 \pm 0.018_{stat} \pm 0.038_{sys})\times10^{21}$ yr. This is the most precise determination of the $^{76}$Ge two-neutrino double-$尾$ decay… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.09795v1-abstract-full').style.display = 'inline'; document.getElementById('2308.09795v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.09795v1-abstract-full" style="display: none;"> We present the measurement of the two-neutrino double-$尾$ decay rate of $^{76}$Ge performed with the GERDA Phase II experiment. With a subset of the entire GERDA exposure, 11.8 kg$\cdot$yr, the half-life of the process has been determined: $T^{2谓}_{1/2} = (2.022 \pm 0.018_{stat} \pm 0.038_{sys})\times10^{21}$ yr. This is the most precise determination of the $^{76}$Ge two-neutrino double-$尾$ decay half-life and one of the most precise measurements of a double-$尾$ decay process. The relevant nuclear matrix element can be extracted: $M^{2谓}_{\text{eff}} = (0.101\pm0.001).$ <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.09795v1-abstract-full').style.display = 'none'; document.getElementById('2308.09795v1-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 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 131 (2023) 142501 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.16542">arXiv:2307.16542</a> <span> [<a href="https://arxiv.org/pdf/2307.16542">pdf</a>, <a href="https://arxiv.org/format/2307.16542">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-023-11862-8">10.1140/epjc/s10052-023-11862-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for tri-nucleon decays of $^{76}$Ge in 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=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G">G. Araujo</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=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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Calgaro%2C+S">S. Calgaro</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=Chiu%2C+P+-">P. -J. Chiu</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+Giacinto%2C+A">A. Di Giacinto</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="2307.16542v1-abstract-short" style="display: inline;"> We search for tri-nucleon decays of $^{76}$Ge in the dataset from the GERmanium Detector Array (GERDA) experiment. Decays that populate excited levels of the daughter nucleus above the threshold for particle emission lead to disintegration and are not considered. The ppp-, ppn-, and pnn-decays lead to $^{73}$Cu, $^{73}$Zn, and $^{73}$Ga nuclei, respectively. These nuclei are unstable and eventuall… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.16542v1-abstract-full').style.display = 'inline'; document.getElementById('2307.16542v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.16542v1-abstract-full" style="display: none;"> We search for tri-nucleon decays of $^{76}$Ge in the dataset from the GERmanium Detector Array (GERDA) experiment. Decays that populate excited levels of the daughter nucleus above the threshold for particle emission lead to disintegration and are not considered. The ppp-, ppn-, and pnn-decays lead to $^{73}$Cu, $^{73}$Zn, and $^{73}$Ga nuclei, respectively. These nuclei are unstable and eventually proceed by the beta decay of $^{73}$Ga to $^{73}$Ge (stable). We search for the $^{73}$Ga decay exploiting the fact that it dominantly populates the 66.7 keV $^{73m}$Ga state with half-life of 0.5 s. The nnn-decays of $^{76}$Ge that proceed via $^{73m}$Ge are also included in our analysis. We find no signal candidate and place a limit on the sum of the decay widths of the inclusive tri-nucleon decays that corresponds to a lower lifetime limit of 1.2x10$^{26}$ yr (90% credible interval). This result improves previous limits for tri-nucleon decays by one to three orders of magnitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.16542v1-abstract-full').style.display = 'none'; document.getElementById('2307.16542v1-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> 31 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 9 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 83 (2023) 778 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.02856">arXiv:2212.02856</a> <span> [<a href="https://arxiv.org/pdf/2212.02856">pdf</a>, <a href="https://arxiv.org/format/2212.02856">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/s10052-023-11354-9">10.1140/epjc/s10052-023-11354-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Liquid argon light collection and veto modeling in GERDA Phase II </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=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G+R">G. R. Araujo</a>, <a href="/search/nucl-ex?searchtype=author&query=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=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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Calgaro%2C+S">S. Calgaro</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=Chiu%2C+P">P-J. Chiu</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+Giacinto%2C+A">A. Di Giacinto</a> , et al. (94 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.02856v1-abstract-short" style="display: inline;"> The ability to detect liquid argon scintillation light from within a densely packed high-purity germanium detector array allowed the GERDA experiment to reach an exceptionally low background rate in the search for neutrinoless double beta decay of $^{76}$Ge. Proper modeling of the light propagation throughout the experimental setup, from any origin in the liquid argon volume to its eventual detect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.02856v1-abstract-full').style.display = 'inline'; document.getElementById('2212.02856v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.02856v1-abstract-full" style="display: none;"> The ability to detect liquid argon scintillation light from within a densely packed high-purity germanium detector array allowed the GERDA experiment to reach an exceptionally low background rate in the search for neutrinoless double beta decay of $^{76}$Ge. Proper modeling of the light propagation throughout the experimental setup, from any origin in the liquid argon volume to its eventual detection by the novel light read-out system, provides insight into the rejection capability and is a necessary ingredient to obtain robust background predictions. In this paper, we present a model of the GERDA liquid argon veto, as obtained by Monte Carlo simulations and constrained by calibration data, and highlight its application for background decomposition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.02856v1-abstract-full').style.display = 'none'; document.getElementById('2212.02856v1-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 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.01671">arXiv:2209.01671</a> <span> [<a href="https://arxiv.org/pdf/2209.01671">pdf</a>, <a href="https://arxiv.org/format/2209.01671">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Search for exotic physics in double-$尾$ decays with GERDA Phase II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=The+GERDA+collaboration"> The 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=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G">G. Araujo</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=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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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+Giacinto%2C+A">A. Di Giacinto</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=Doroshkevich%2C+E">E. Doroshkevich</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="2209.01671v1-abstract-short" style="display: inline;"> A search for Beyond the Standard Model double-$尾$ decay modes of $^{76}$Ge has been performed with data collected during the Phase II of the GERmanium Detector Array (GERDA) experiment, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). Improved limits on the decays involving Majorons have been obtained, compared to previous experiments with $^{76}$Ge, with half-life values on the ord… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.01671v1-abstract-full').style.display = 'inline'; document.getElementById('2209.01671v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.01671v1-abstract-full" style="display: none;"> A search for Beyond the Standard Model double-$尾$ decay modes of $^{76}$Ge has been performed with data collected during the Phase II of the GERmanium Detector Array (GERDA) experiment, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). Improved limits on the decays involving Majorons have been obtained, compared to previous experiments with $^{76}$Ge, with half-life values on the order of 10$^{23}$ yr. For the first time with $^{76}$Ge, limits on Lorentz invariance violation effects in double-$尾$ decay have been obtained. The isotropic coefficient $\mathring{a}_\text{of}^{(3)}$, which embeds Lorentz violation in double-$尾$ decay, has been constrained at the order of $10^{-6}$ GeV. We also set the first experimental limits on the search for light exotic fermions in double-$尾$ decay, including sterile neutrinos. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.01671v1-abstract-full').style.display = 'none'; document.getElementById('2209.01671v1-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 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.13355">arXiv:2202.13355</a> <span> [<a href="https://arxiv.org/pdf/2202.13355">pdf</a>, <a href="https://arxiv.org/format/2202.13355">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/s10052-022-10163-w">10.1140/epjc/s10052-022-10163-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pulse shape analysis in GERDA Phase II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=The+GERDA+collaboration"> The 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=Araujo%2C+G">G. Araujo</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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Doroshkevich%2C+E">E. Doroshkevich</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="2202.13355v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double-$尾$ decay in $^{76}$Ge using isotopically enriched high purity germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After Phase I (2011-2013), the experiment benefited from several upgrades, including an additional active veto based on LAr instrumentation and a significant increase of mass by poi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.13355v1-abstract-full').style.display = 'inline'; document.getElementById('2202.13355v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.13355v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double-$尾$ decay in $^{76}$Ge using isotopically enriched high purity germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After Phase I (2011-2013), the experiment benefited from several upgrades, including an additional active veto based on LAr instrumentation and a significant increase of mass by point-contact germanium detectors that improved the half-life sensitivity of Phase II (2015-2019) by an order of magnitude. At the core of the background mitigation strategy, the analysis of the time profile of individual pulses provides a powerful topological discrimination of signal-like and background-like events. Data from regular $^{228}$Th calibrations and physics data were both considered in the evaluation of the pulse shape discrimination performance. In this work, we describe the various methods applied to the data collected in GERDA Phase II corresponding to an exposure of 103.7 kg$\cdot$yr. These methods suppress the background by a factor of about 5 in the region of interest around Q$_{尾尾}$ = 2039 keV, while preserving (81$\pm$3)% of the signal. In addition, an exhaustive list of parameters is provided which were used in the final data analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.13355v1-abstract-full').style.display = 'none'; document.getElementById('2202.13355v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 82 (2022) 284 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.11462">arXiv:2107.11462</a> <span> [<a href="https://arxiv.org/pdf/2107.11462">pdf</a>, <a href="https://arxiv.org/format/2107.11462">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> LEGEND-1000 Preconceptual Design Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=LEGEND+Collaboration"> LEGEND Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Abt%2C+I">I. Abt</a>, <a href="/search/nucl-ex?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/nucl-ex?searchtype=author&query=Alexander%2C+A">A. Alexander</a>, <a href="/search/nucl-ex?searchtype=author&query=Andreoiu%2C+C">C. Andreoiu</a>, <a href="/search/nucl-ex?searchtype=author&query=Araujo%2C+G+R">G. R. Araujo</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Bae%2C+W">W. Bae</a>, <a href="/search/nucl-ex?searchtype=author&query=Bakalyarov%2C+A">A. Bakalyarov</a>, <a href="/search/nucl-ex?searchtype=author&query=Balata%2C+M">M. Balata</a>, <a href="/search/nucl-ex?searchtype=author&query=Bantel%2C+M">M. Bantel</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Barbeau%2C+P+S">P. S. Barbeau</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+C+J">C. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Barton%2C+P+J">P. J. Barton</a>, <a href="/search/nucl-ex?searchtype=author&query=Baudis%2C+L">L. Baudis</a>, <a href="/search/nucl-ex?searchtype=author&query=Bauer%2C+C">C. Bauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernieri%2C+E">E. Bernieri</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bhimani%2C+K+H">K. H. Bhimani</a>, <a href="/search/nucl-ex?searchtype=author&query=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Blalock%2C+E">E. Blalock</a>, <a href="/search/nucl-ex?searchtype=author&query=Bolozdynya%2C+A">A. Bolozdynya</a> , et al. (239 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.11462v1-abstract-short" style="display: inline;"> We propose the construction of LEGEND-1000, the ton-scale Large Enriched Germanium Experiment for Neutrinoless $尾尾$ Decay. This international experiment is designed to answer one of the highest priority questions in fundamental physics. It consists of 1000 kg of Ge detectors enriched to more than 90% in the $^{76}$Ge isotope operated in a liquid argon active shield at a deep underground laboratory… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.11462v1-abstract-full').style.display = 'inline'; document.getElementById('2107.11462v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.11462v1-abstract-full" style="display: none;"> We propose the construction of LEGEND-1000, the ton-scale Large Enriched Germanium Experiment for Neutrinoless $尾尾$ Decay. This international experiment is designed to answer one of the highest priority questions in fundamental physics. It consists of 1000 kg of Ge detectors enriched to more than 90% in the $^{76}$Ge isotope operated in a liquid argon active shield at a deep underground laboratory. By combining the lowest background levels with the best energy resolution in the field, LEGEND-1000 will perform a quasi-background-free search and can make an unambiguous discovery of neutrinoless double-beta decay with just a handful of counts at the decay $Q$ value. The experiment is designed to probe this decay with a 99.7%-CL discovery sensitivity in the $^{76}$Ge half-life of $1.3\times10^{28}$ years, corresponding to an effective Majorana mass upper limit in the range of 9-21 meV, to cover the inverted-ordering neutrino mass scale with 10 yr of live time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.11462v1-abstract-full').style.display = 'none'; document.getElementById('2107.11462v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.15111">arXiv:2103.15111</a> <span> [<a href="https://arxiv.org/pdf/2103.15111">pdf</a>, <a href="https://arxiv.org/format/2103.15111">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/s10052-021-09184-8">10.1140/epjc/s10052-021-09184-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of inverted coaxial $^{76}$Ge detectors in GERDA for future double-$尾$ decay experiments </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=Araujo%2C+G+R">G. R. Araujo</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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Doroshkevich%2C+E">E. Doroshkevich</a> , et al. (86 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="2103.15111v1-abstract-short" style="display: inline;"> Neutrinoless double-$尾$ decay of $^{76}$Ge is searched for with germanium detectors where source and detector of the decay are identical. For the success of future experiments it is important to increase the mass of the detectors. We report here on the characterization and testing of five prototype detectors manufactured in inverted coaxial (IC) geometry from material enriched to 88% in $^{76}$Ge.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.15111v1-abstract-full').style.display = 'inline'; document.getElementById('2103.15111v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.15111v1-abstract-full" style="display: none;"> Neutrinoless double-$尾$ decay of $^{76}$Ge is searched for with germanium detectors where source and detector of the decay are identical. For the success of future experiments it is important to increase the mass of the detectors. We report here on the characterization and testing of five prototype detectors manufactured in inverted coaxial (IC) geometry from material enriched to 88% in $^{76}$Ge. IC detectors combine the large mass of the traditional semi-coaxial Ge detectors with the superior resolution and pulse shape discrimination power of point contact detectors which exhibited so far much lower mass. Their performance has been found to be satisfactory both when operated in vacuum cryostat and bare in liquid argon within the GERDA setup. The measured resolutions at the Q-value for double-$尾$ decay of $^{76}$Ge (Q$_{尾尾}$ = 2039 keV) are about 2.1 keV full width at half maximum in vacuum cryostat. After 18 months of operation within the ultra-low background environment of the GERmanium Detector Array (GERDA) experiment and an accumulated exposure of 8.5 kg$\cdot$yr, the background index after analysis cuts is measured to be $4.9^{+7.3}_{-3.4}\times 10^{-4}$ counts /(keV$\cdot$kg$\cdot$yr) around Q$_{尾尾}$. This work confirms the feasibility of IC detectors for the next-generation experiment LEGEND. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.15111v1-abstract-full').style.display = 'none'; document.getElementById('2103.15111v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 12 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 81, 505 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.13777">arXiv:2103.13777</a> <span> [<a href="https://arxiv.org/pdf/2103.13777">pdf</a>, <a href="https://arxiv.org/format/2103.13777">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/s10052-021-09403-2">10.1140/epjc/s10052-021-09403-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Calibration of 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=Araujo%2C+G+R">G. R. Araujo</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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Doroshkevich%2C+E">E. Doroshkevich</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="2103.13777v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double-$尾$ decay in $^{76}$Ge with an array of about 40 high-purity isotopically-enriched germanium detectors. The experimental signature of the decay is a monoenergetic signal at Q$_{尾尾}$ = 2039.061(7)keV in the measured summed energy spectrum of the two emitted electrons. Both the energy reconstruction and resolution of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.13777v1-abstract-full').style.display = 'inline'; document.getElementById('2103.13777v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.13777v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double-$尾$ decay in $^{76}$Ge with an array of about 40 high-purity isotopically-enriched germanium detectors. The experimental signature of the decay is a monoenergetic signal at Q$_{尾尾}$ = 2039.061(7)keV in the measured summed energy spectrum of the two emitted electrons. Both the energy reconstruction and resolution of the germanium detectors are crucial to separate a potential signal from various backgrounds, such as neutrino-accompanied double-$尾$ decays allowed by the Standard Model. The energy resolution and stability were determined and monitored as a function of time using data from regular $^{228}$Th calibrations. In this work, we describe the calibration process and associated data analysis of the full GERDA dataset, tailored to preserve the excellent resolution of the individual germanium detectors when combining data over several years. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.13777v1-abstract-full').style.display = 'none'; document.getElementById('2103.13777v1-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> 25 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 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 81, 682 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.06079">arXiv:2009.06079</a> <span> [<a href="https://arxiv.org/pdf/2009.06079">pdf</a>, <a href="https://arxiv.org/format/2009.06079">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.252502">10.1103/PhysRevLett.125.252502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Final Results of GERDA on the Search for Neutrinoless 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=Araujo%2C+G+R">G. R. Araujo</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=Biancacci%2C+V">V. Biancacci</a>, <a href="/search/nucl-ex?searchtype=author&query=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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> , 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="2009.06079v1-abstract-short" style="display: inline;"> The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$尾$ ($0谓尾尾$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in $^{76}$Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of $5.2\times10^{-4}$ co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.06079v1-abstract-full').style.display = 'inline'; document.getElementById('2009.06079v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.06079v1-abstract-full" style="display: none;"> The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$尾$ ($0谓尾尾$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in $^{76}$Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of $5.2\times10^{-4}$ counts/(keV$\cdot$kg$\cdot$yr) in the signal region and met the design goal to collect an exposure of 100 kg$\cdot$yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg$\cdot$yr of total exposure. A limit on the half-life of $0谓尾尾$ decay in $^{76}$Ge is set at $T_{1/2}>1.8\times10^{26}$ yr at 90% C.L., which coincides with the sensitivity assuming no signal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.06079v1-abstract-full').style.display = 'none'; document.getElementById('2009.06079v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures, submitted to Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 252502 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.14184">arXiv:2005.14184</a> <span> [<a href="https://arxiv.org/pdf/2005.14184">pdf</a>, <a href="https://arxiv.org/format/2005.14184">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.011801">10.1103/PhysRevLett.125.011801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The first search for bosonic super-WIMPs with masses up to 1 MeV/c$^2$ 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=Borowicz%2C+D">D. Borowicz</a>, <a href="/search/nucl-ex?searchtype=author&query=Bossio%2C+E">E. Bossio</a>, <a href="/search/nucl-ex?searchtype=author&query=Bothe%2C+V">V. Bothe</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=Doroshkevich%2C+E">E. Doroshkevich</a>, <a href="/search/nucl-ex?searchtype=author&query=Egorov%2C+V">V. Egorov</a> , et al. (84 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="2005.14184v2-abstract-short" style="display: inline;"> We present the first search for bosonic super-WIMPs as keV-scale dark matter candidates performed with the GERDA experiment. GERDA is a neutrinoless double-beta decay experiment which operates high-purity germanium detectors enriched in $^{76}$Ge in an ultra-low background environment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy. Searches were performed for pseudoscalar and v… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14184v2-abstract-full').style.display = 'inline'; document.getElementById('2005.14184v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.14184v2-abstract-full" style="display: none;"> We present the first search for bosonic super-WIMPs as keV-scale dark matter candidates performed with the GERDA experiment. GERDA is a neutrinoless double-beta decay experiment which operates high-purity germanium detectors enriched in $^{76}$Ge in an ultra-low background environment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy. Searches were performed for pseudoscalar and vector particles in the mass region from 60 keV/c$^2$ to 1 MeV/c$^2$. No evidence for a dark matter signal was observed, and the most stringent constraints on the couplings of super-WIMPs with masses above 120 keV/c$^2$ have been set. As an example, at a mass of 150 keV/c$^2$ the most stringent direct limits on the dimensionless couplings of axion-like particles and dark photons to electrons of $g_{ae} < 3 \cdot 10^{-12}$ and ${伪'}/伪 < 6.5 \cdot 10^{-24}$ at 90% credible interval, respectively, were obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14184v2-abstract-full').style.display = 'none'; document.getElementById('2005.14184v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, submitted to Physical Review Letters, added list of authors, updated ref. [21]</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 011801 (2020) </p> </li> <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/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/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/1510.09002">arXiv:1510.09002</a> <span> [<a href="https://arxiv.org/pdf/1510.09002">pdf</a>, <a href="https://arxiv.org/ps/1510.09002">ps</a>, <a href="https://arxiv.org/format/1510.09002">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"> Characteristics of a thermal neutrons scintillation detector with the [ZnS(Ag)+$^6$LiF] at different conditions of measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alekseenko%2C+V+V">V. V. Alekseenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I+R">I. R. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Etezov%2C+R+A">R. A. Etezov</a>, <a href="/search/nucl-ex?searchtype=author&query=Gavrilyuk%2C+Y+M">Yu. M. Gavrilyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Gangapshev%2C+A+M">A. M. Gangapshev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gezhaev%2C+A+M">A. M. Gezhaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Kazalov%2C+V+V">V. V. Kazalov</a>, <a href="/search/nucl-ex?searchtype=author&query=Khokonov%2C+A+K">A. Kh. Khokonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuzminov%2C+V+V">V. V. Kuzminov</a>, <a href="/search/nucl-ex?searchtype=author&query=Panasenko%2C+S+I">S. I. Panasenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ratkevich%2C+S+S">S. S. Ratkevich</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="1510.09002v1-abstract-short" style="display: inline;"> A construction of a thermal neutron testing detector with a thin [ZnS(Ag)+$^6$LiF] scintillator is described. Results of an investigation of sources of the detector pulse origin and the pulse features in a ground and underground conditions are presented. Measurements of the scintillator own background, registration efficiency and a neutron flux at different objects of the BNO INR RAS were performe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.09002v1-abstract-full').style.display = 'inline'; document.getElementById('1510.09002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.09002v1-abstract-full" style="display: none;"> A construction of a thermal neutron testing detector with a thin [ZnS(Ag)+$^6$LiF] scintillator is described. Results of an investigation of sources of the detector pulse origin and the pulse features in a ground and underground conditions are presented. Measurements of the scintillator own background, registration efficiency and a neutron flux at different objects of the BNO INR RAS were performed. The results are compared with the ones measured by the $^3$He proportional counter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.09002v1-abstract-full').style.display = 'none'; document.getElementById('1510.09002v1-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> 30 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">6 pages, 6 figures, 1 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1510.05109">arXiv:1510.05109</a> <span> [<a href="https://arxiv.org/pdf/1510.05109">pdf</a>, <a href="https://arxiv.org/ps/1510.05109">ps</a>, <a href="https://arxiv.org/format/1510.05109">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"> Results of measurements of an environment neutron background at BNO INR RAS objects with the helium proportional counter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Alekseenko%2C+V+V">V. V. Alekseenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I+R">I. R. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Etezov%2C+R+A">R. A. Etezov</a>, <a href="/search/nucl-ex?searchtype=author&query=Gavrilyuk%2C+Y+M">Yu. M. Gavrilyuk</a>, <a href="/search/nucl-ex?searchtype=author&query=Gangapshev%2C+A+M">A. M. Gangapshev</a>, <a href="/search/nucl-ex?searchtype=author&query=Gezhaev%2C+A+M">A. M. Gezhaev</a>, <a href="/search/nucl-ex?searchtype=author&query=Kazalov%2C+V+V">V. V. Kazalov</a>, <a href="/search/nucl-ex?searchtype=author&query=Khokonov%2C+A+K">A. Kh. Khokonov</a>, <a href="/search/nucl-ex?searchtype=author&query=Kuzminov%2C+V+V">V. V. Kuzminov</a>, <a href="/search/nucl-ex?searchtype=author&query=Panasenko%2C+S+I">S. I. Panasenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ratkevich%2C+S+S">S. S. Ratkevich</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="1510.05109v2-abstract-short" style="display: inline;"> A method of measurements of the environmental neutron background at the Baksan Neutrino Observatory of the INR RAS are described. Measurements were done by using of a proportional counter filled with mixture of Ar(2 at)+$^3$He(4 at). The results obtained at the surface and the underground laboratory of the BNO INR RAS are presented. It is shown that a neutron background in the underground laborato… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.05109v2-abstract-full').style.display = 'inline'; document.getElementById('1510.05109v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.05109v2-abstract-full" style="display: none;"> A method of measurements of the environmental neutron background at the Baksan Neutrino Observatory of the INR RAS are described. Measurements were done by using of a proportional counter filled with mixture of Ar(2 at)+$^3$He(4 at). The results obtained at the surface and the underground laboratory of the BNO INR RAS are presented. It is shown that a neutron background in the underground laboratory at the 4900 m w.e. depth is decreased by $\sim 260$ times without any special shield in a comparison with the Earth surface. A neutron flux density in the 5-1323.5~cm air height region is constant within the determination error and equal to $(7.1\pm0.1_{\rm{stat}}\pm0.3_{\rm{syst}})\times10^{-3}$ s$^{-1}\cdot$cm$^{-2}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.05109v2-abstract-full').style.display = 'none'; document.getElementById('1510.05109v2-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 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">5 pages, 4 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/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> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0511049">arXiv:nucl-ex/0511049</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0511049">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0511049">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0511049">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nimb.2006.05.011">10.1016/j.nimb.2006.05.011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Cosmogenic activation of Germanium and its reduction for low background experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Barabanov%2C+I">I. Barabanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Belogurov%2C+S">S. Belogurov</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Denisov%2C+A">A. Denisov</a>, <a href="/search/nucl-ex?searchtype=author&query=Kornoukhov%2C+V">V. Kornoukhov</a>, <a href="/search/nucl-ex?searchtype=author&query=Sobolevsky%2C+N">N. Sobolevsky</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="nucl-ex/0511049v1-abstract-short" style="display: inline;"> Production of $^{60}$Co and $^{68}$Ge from stable isotopes of Germanium by nuclear active component of cosmic rays is a principal background source for a new generation of $^{76}$Ge double beta decay experiments like GERDA and Majorana. The biggest amount of cosmogenic activity is expected to be produced during transportation of either enriched material or already grown crystal. In this letter… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0511049v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0511049v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0511049v1-abstract-full" style="display: none;"> Production of $^{60}$Co and $^{68}$Ge from stable isotopes of Germanium by nuclear active component of cosmic rays is a principal background source for a new generation of $^{76}$Ge double beta decay experiments like GERDA and Majorana. The biggest amount of cosmogenic activity is expected to be produced during transportation of either enriched material or already grown crystal. In this letter properties and feasibility of a movable iron shield are discussed. Activation reduction factor of about 10 is predicted by simulations with SHIELD code for a simple cylindrical configuration. It is sufficient for GERDA Phase II background requirements. Possibility of further increase of reduction factor and physical limitations are considered. Importance of activation reduction during Germanium purification and detector manufacturing is emphasized. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0511049v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0511049v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2005. </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, 3 tables, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.B251:115-120,2006 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: 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