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Search for trinucleon decay in the Majorana Demonstrator

  • Author(s): Alvis, SI
  • Arnquist, IJ
  • Avignone, FT
  • Barabash, AS
  • Barton, CJ
  • Basu, V
  • Bertrand, FE
  • Bos, B
  • Brudanin, V
  • Busch, M
  • Buuck, M
  • Caldwell, TS
  • Chan, YD
  • Christofferson, CD
  • Chu, PH
  • Cuesta, C
  • Detwiler, JA
  • Efremenko, Y
  • Ejiri, H
  • Elliott, SR
  • Gilliss, T
  • Giovanetti, GK
  • Green, MP
  • Gruszko, J
  • Guinn, IS
  • Guiseppe, VE
  • Haufe, CR
  • Hegedus, RJ
  • Hehn, L
  • Henning, R
  • Hervas Aguilar, D
  • Hoppe, EW
  • Howe, MA
  • Keeter, KJ
  • Kidd, MF
  • Konovalov, SI
  • Kouzes, RT
  • Lopez, AM
  • Martin, RD
  • Massarczyk, R
  • Meijer, SJ
  • Mertens, S
  • Myslik, J
  • Othman, G
  • Pettus, W
  • Piliounis, A
  • Poon, AWP
  • Radford, DC
  • Rager, J
  • Reine, AL
  • Rielage, K
  • Ruof, NW
  • Shanks, B
  • Shirchenko, M
  • Tedeschi, D
  • Varner, RL
  • Vasilyev, S
  • White, BR
  • Wilkerson, JF
  • Wiseman, C
  • Xu, W
  • Yakushev, E
  • Yu, CH
  • Yumatov, V
  • Zhitnikov, I
  • Zhu, BX
  • et al.
Abstract

© 2019 authors. Published by the American Physical Society. The Majorana Demonstrator is an ultra-low-background experiment searching for neutrinoless double-beta decay in Ge76. 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 trinucleon decay-specific modes and invisible decay modes for Ge isotopes. We find a half-life limit of 4.9×1025 yr for the decay Ge76(ppn)→Zn73 e+π+ and 4.7×1025 yr for the decay Ge76(ppp)→Cu73 e+π+π+. The half-life limit for the invisible triproton decay mode of Ge76 was found to be 7.5×1024 yr.

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