GERDA 实验对 $^{36}$Ar 无中微子双电子俘获的改进上限
核实验
2023-11-07 v1
摘要
GERmanium Detector Array (GERDA) 实验在液氩低温恒温器中运行富集高纯锗探测器，液氩含有 0.33% 的 Ar，该同位素是双中微子双电子俘获 (2ECEC) 因而也是无中微子双电子俘获 (0ECEC) 的候选核素。若被探测到，该过程将为轻子数不守恒及中微子的 Majorana 性质提供证据。在 Ar 的辐射型 0ECEC 中，会发射能量为 429.88 keV 的单色光子，可被 GERDA 锗探测器探测。我们利用 GERDA 数据搜寻 Ar 的 0ECEC，总存活时间为 4.34 年（GERDA 第二阶段积累 3.08 年，第一阶段积累 1.26 年）。未发现信号，并以此建立了该过程半衰期 90% 置信度下限 T > 1.5x10 yr。
引用
@article{arxiv.2311.02214,
title = {An improved limit on the neutrinoless double-electron capture of $^{36}$Ar with GERDA},
author = {GERDA Collaboration and M. Agostini and A. Alexander and G. R. Araujo and A. M. Bakalyarov and M. Balata and I. Barabanov and L. Baudis and C. Bauer and S. Belogurov and A. Bettini and L. Bezrukov and V. Biancacci and E. Bossio and V. Bothe and V. Brudanin and R. Brugnera and A. Caldwell and C. Cattadori and A. Chernogorov and T. Comellato and V. D'Andrea and E. V. Demidova and N. Di Marco and E. Doroshkevich and F. Fischer and M. Fomina and A. Gangapshev and A. Garfagnini and C. Gooch and P. Grabmayr and V. Gurentsov and K. Gusev and J. Hakenmüller and S. Hemmer and W. Hofmann and J. Huang and M. Hult and L. V. Inzhechik and J. Janicskó Csáthy and J. Jochum and M. Junker and V. Kazalov and Y. Kermaïdic and H. Khushbakht and T. Kihm and K. Kilgus and I. V. Kirpichnikov and A. Klimenko and R. Kneißl and K. T. Knöpfle and O. Kochetov and V. N. Kornoukhov and M. Korošec and P. Krause and V. V. Kuzminov and M. Laubenstein and M. Lindner and I. Lippi and A. Lubashevskiy and B. Lubsandorzhiev and G. Lutter and C. Macolino and B. Majorovits and W. Maneschg and L. Manzanillas and G. Marshall and M. Misiaszek and M. Morella and Y. Müller and I. Nemchenok and L. Pandola and K. Pelczar and L. Pertoldi and P. Piseri and A. Pullia and C. Ransom and L. Rauscher and M. Redchuk and S. Riboldi and N. Rumyantseva and C. Sada and F. Salamida and S. Schönert and J. Schreiner and M. Schütt and A-K. Schütz and O. Schulz and M. Schwarz and B. Schwingenheuer and O. Selivanenko and E. Shevchik and M. Shirchenko and L. Shtembari and H. Simgen and A. Smolnikov and D. Stukov and A. A. Vasenko and A. Veresnikova and C. Vignoli and K. von Sturm and T. Wester and C. Wiesinger and M. Wojcik and E. Yanovich and B. Zatschler and I. Zhitnikov and S. V. Zhukov and D. Zinatulina and A. Zschocke and A. J. Zsigmond and K. Zuber and G. Zuzel},
journal= {arXiv preprint arXiv:2311.02214},
year = {2023}
}
备注
10 pages, 5 figures, 1 table