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arXiv · 1812.01090

Search for Tri-Nucleon Decay in the Majorana Demonstrator

S. I. Alvis·I. J. Arnquist·F. T. Avignone III·A. S. Barabash·C. J. Barton·F. E. Bertrand·B. Bos·V. Brudanin·M. Busch·M. Buuck·T. S. Caldwell·Y-D. Chan·C. D. Christofferson·P. -H. Chu·C. Cuesta·J. A. Detwiler·Yu. Efremenko·H. Ejiri·S. R. Elliott·T. Gilliss·G. K. Giovanetti·M. P. Green·J. Gruszko·I. S. Guinn·V. E. Guiseppe·C. R. Haufe·R. J. Hegedus·L. Hehn·R. Henning·D. Hervas Aguilar·E. W. Hoppe·M. A. Howe·K. J. Keeter·M. F. Kidd·S. I. Konovalov·R. T. Kouzes·A. M. Lopez·R. D. Martin·R. Massarczyk·S. J. Meijer·S. Mertens·J. Myslik·G. Othman·W. Pettus·A. Piliounis·A. W. P. Poon·D. C. Radford·J. Rager·A. L. Reine·K. Rielage·N. W. Ruof·B. Shanks·M. Shirchenko·D. Tedeschi·R. L. Varner·S. Vasilyev·Vasundhara·B. R. White·J. F. Wilkerson·C. Wiseman·W. Xu·E. Yakushev·C. -H. Yu·V. Yumatov·I. Zhitnikov·B. X. Zhu
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Abstract

The Majorana Demonstrator is an ultra low-background experiment searching for neutrinoless double-beta decay in $^{76}$Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. We present the first limits for tri-nucleon decay-specific modes and invisible decay modes for Ge isotopes. We find a half-life limit of $4.9 \times 10^{25}$ yr for the decay $^{76}{\rm Ge(ppn)} \to {}^{73}{\rm Zn}\ e^+\pi^+$ and $4.7\times10^{25}$ yr for the decay $^{76}{\rm Ge(ppp)} \to ^{73}{\rm Cu}\ e^+\pi^+\pi^+$. The half-life limit for the invisible tri-proton decay mode of $^{76}$Ge was found to be $7.5\times10^{24}$ yr.

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S. I. Alvis, I. J. Arnquist, F. T. Avignone III, A. S. Barabash, C. J. Barton, F. E. Bertrand, B. Bos, V. Brudanin, M. Busch, M. Buuck, T. S. Caldwell, Y-D. Chan, C. D. Christofferson, P. -H. Chu, C. Cuesta, J. A. Detwiler, Yu. Efremenko, H. Ejiri, S. R. Elliott, T. Gilliss, G. K. Giovanetti, M. P. Green, J. Gruszko, I. S. Guinn, V. E. Guiseppe, C. R. Haufe, R. J. Hegedus, L. Hehn, R. Henning, D. Hervas Aguilar, E. W. Hoppe, M. A. Howe, K. J. Keeter, M. F. Kidd, S. I. Konovalov, R. T. Kouzes, A. M. Lopez, R. D. Martin, R. Massarczyk, S. J. Meijer, S. Mertens, J. Myslik, G. Othman, W. Pettus, A. Piliounis, A. W. P. Poon, D. C. Radford, J. Rager, A. L. Reine, K. Rielage, N. W. Ruof, B. Shanks, M. Shirchenko, D. Tedeschi, R. L. Varner, S. Vasilyev, Vasundhara, B. R. White, J. F. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, C. -H. Yu, V. Yumatov, I. Zhitnikov, B. X. Zhu. 2018-12-03. Search for Tri-Nucleon Decay in the Majorana Demonstrator. https://doi.org/10.1103/physrevd.99.072004

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