The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND)
LEGEND Collaboration, N. Abgrall, A. Abramov, N. Abrosimov, I. Abt, M. Agostini, M. Agartioglu, A. Ajjaq, S. I. Alvis, F. T. Avignone, X. Bai, M. Balata, I. Bar… 展开作者
LEGEND Collaboration, N. Abgrall, A. Abramov, N. Abrosimov, I. Abt, M. Agostini, M. Agartioglu, A. Ajjaq, S. I. Alvis, F. T. Avignone, X. Bai, M. Balata, I. Barabanov, A. S. Barabash, P. J. Barton, L. Baudis, L. Bezrukov, T. Bode, A. Bolozdynya, D. Borowicz, A. Boston, H. Boston, S. T. P. Boyd, R. Breier, V. Brudanin, R. Brugnera, M. Busch, M. Buuck, A. Caldwell, T. S. Caldwell, T. Camellato, M. Carpenter, C. Cattadori, J. Cederkäll, Y. -D. Chan, S. Chen, A. Chernogorov, C. D. Christofferson, P. -H. Chu, R. J. Cooper, C. Cuesta, E. V. Demidova, Z. Deng, M. Deniz, J. A. Detwiler, N. Di Marco, A. Domula, Q. Du, Yu. Efremenko, V. Egorov, S. R. Elliott, D. Fields, F. Fischer, A. Galindo-Uribarri, A. Gangapshev, A. Garfagnini, T. Gilliss, M. Giordano, G. K. Giovanetti, M. Gold, P. Golubev, C. Gooch, P. Grabmayr, M. P. Green, J. Gruszko, I. S. Guinn, V. E. Guiseppe, V. Gurentsov, Y. Gurov, K. Gusev, J. Hakenmüeller, L. Harkness-Brennan, Z. R. Harvey, C. R. Haufe, L. Hauertmann, D. Heglund, L. Hehn, A. Heinz, R. Hiller, J. Hinton, R. Hodak, W. Hofmann, S. Howard, M. A. Howe, M. Hult, L. V. Inzhechik, J. Janicskó Csáthy, R. Janssens, M. Ješkovský, J. Jochum, H. T. Johansson, D. Judson, M. Junker, J. Kaizer, K. Kang, V. Kazalov, Y. Kermaïdic, F. Kiessling, A. Kirsch, A. Kish, A. Klimenko, K. T. K. T. Knöpfle, O. Kochetov, S. I. Konovalov, I. Kontul, V. N. Kornoukhov, T. Kraetzschmar, K. Kröninger, A. Kumar, V. V. Kuzminov, K. Lang, M. Laubenstein, A. Lazzaro, Y. L. Li, Y. -Y. Li, H. B. Li, S. T. Lin, M. Lindner, I. Lippi, S. K. Liu, X. Liu, J. Liu, D. Loomba, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, H. Ma, B. Majorovits, F. Mamedov, R. D. Martin, R. Massarczyk, J. A. J. Matthews, N. McFadden, D. -M. Mei, H. Mei, S. J. Meijer, D. Mengoni, S. Mertens, W. Miller, M. Miloradovic, R. Mingazheva, M. Misiaszek, P. Moseev, J. Myslik, I. Nemchenok, T. Nilsson, P. Nolan, C. O'Shaughnessy, G. Othman, K. Panas, L. Pandola, L. Papp, K. Pelczar, D. Peterson, W. Pettus, A. W. P. Poon, P. P. Povinec, A. Pullia, X. C. Quintana, D. C. Radford, J. Rager, C. Ransom, F. Recchia, A. L. Reine, S. Riboldi, K. Rielage, S. Rozov, N. W. Rouf, E. Rukhadze, N. Rumyantseva, R. Saakyan, E. Sala, F. Salamida, V. Sandukovsky, G. Savard, S. Schönert, A. -K. Schütz, O. Schulz, M. Schuster, B. Schwingenheuer, O. Selivanenko, B. Sevda, B. Shanks, E. Shevchik, M. Shirchenko, F. Simkovic, L. Singh, V. Singh, M. Skorokhvatov, K. Smolek, A. Smolnikov, A. Sonay, M. Spavorova, I. Stekl, D. Stukov, D. Tedeschi, J. Thompson, T. Van Wechel, R. L. Varner, A. A. Vasenko, S. Vasilyev, A. Veresnikova, K. Vetter, K. von Sturm, K. Vorren, M. Wagner, G. -J. Wang, D. Waters, W. -Z. Wei, T. Wester, B. R. White, C. Wiesinger, J. F. Wilkerson, M. Willers, C. Wiseman, M. Wojcik, H. T. Wong, J. Wyenberg, W. Xu, E. Yakushev, G. Yang, C. -H. Yu, Q. Yue, V. Yumatov, J. Zeman, Z. Zeng, I. Zhitnikov, B. Zhu, D. Zinatulina, A. Zschocke, A. J. Zsigmond, K. Zuber, G. Zuzel
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Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)
The observation of neutrinoless double-beta decay (0$νββ$) 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$νββ$ signal region of all 0$νββ$ 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$νββ$ experimental program with discovery potential at a half-life approaching or at $10^{28}$ years, using existing resources as appropriate to expedite physics results.
Measurement of the Background Activities of a 100Mo-enriched Powder Sample for an AMoRE Crystal Material by using Fourteen High-Purity Germanium Detectors
Final Results of GERDA on the Search for Neutrinoless Double-$β$ Decay
锗探测器阵列（GERDA）实验寻找$^{76}$ Ge的轻子数破坏的无中微子双$β$（$0νββ$）衰变，其发现将在宇宙学和粒子物理学中产生深远的影响。通过在有源液氩屏蔽中操作富含$^{76}$ Ge的裸锗二极管，GERDA在信号区实现了前所未有的低本底指数$5.2\times10^{-4}$计数/（keV $\cdot$ kg $\cdot$ yr），并满足了在无本底状态下收集100 kg $\cdot$ yr暴露量的设计目标。当结合第一阶段的结果时，在127.2 kg $\cdot$/年的总暴露量后未观察到信号。$^{76}$ Ge中$0νββ$衰变半衰期的限值设定为90% C.L.时的$T_{1/2}>1.8\times10^{26}$年，这与假定没有信号时的灵敏度一致。
Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment
Isotopically modified Ge detectors for {\sc Gerda}: from production to operation
\textsc{Gerda}实验通过新颖的脉冲形状鉴别（PSD）技术来搜索无中微子双β（$0νβ$ β $) decay of $ ^{76} $Ge using high-purity germanium detectors made of material enriched in $ ^{76} $Ge. For Phase II of the experiment a sensitivity for the half life $ T_{1/2} ^{0ν}\，\，\sim 2 \cdot 10^{26} $ yr is envisioned. Modified Broad Energy Germanium detectors (BEGe) with thick n$ ^+ $ electrodes provide the capability to efficiently identify and reject background events, while keeping a large acceptance for the $ 0νβ $beta$ -衰变信号。生产厚窗口BEGe型探测器的\textsc{Gerda}实验的可行性证明了通过测试所有的生产步骤，从采购的同位素改性锗工作BEGe探测器。对\textsc{Gerda} Phase II原型BEGe探测器的光谱…
Intrinsic Spatial Position Resolution of P-type Point-Contact Germanium Detector
College of Physics, Sichuan University（四川大学物理学院）；Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University（清华大学工程物理系粒子与辐射成像教育部重点实验室）
Search for Pauli Exclusion Principle Violating Atomic Transitions and Electron Decay with a P-type Point Contact Germanium Detector
使用在Kimballton地下研究设施运行的p型点接触高纯锗探测器收集的89.5 kg-d数据，对违反Pauli不相容原理的K-α电子跃迁进行了搜索。在90% C. L时，跃迁寿命的下限为5.8x10^30秒。通过寻找在10.6 keV处的峰值来设定，该峰值由在跃迁之后存在的X射线和俄歇电子产生。为了寻找原子K壳层电子衰变为中微子的过程，也做了类似的分析，结果是在90 C. L时，衰变的下限为6.8x10^30秒。据估计，MAJORANA DEMONSTRATOR，一个44公斤的p型点接触探测器阵列，将寻找76-Ge的无中微子双β衰变，可以改善这些排除限制的数量级后，三年的操作。
CAGE: An Internal Source Scanning Cryostat for HPGe Characterization
University of North Carolina, Chapel Hill（北卡罗来纳大学教堂山分校）；Triangle Universities Nuclear Laboratory（三角大学核实验室）；University of Washington（华盛顿大学）；Indiana University（印第安纳大学）
