Search for Tri-Nucleon Decay in the Majorana Demonstrator
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Search for Tri-Nucleon Decay in the Majorana Demonstrator

  • Author(s): Alvis, SI
  • Arnquist, IJ
  • III, FT Avignone
  • Barabash, AS
  • Barton, CJ
  • Bertrand, FE
  • Bos, B
  • Brudanin, V
  • Busch, M
  • Buuck, M
  • Caldwell, TS
  • Chan, Y-D
  • Christofferson, CD
  • Chu, P-H
  • Cuesta, C
  • Detwiler, JA
  • Efremenko, Yu
  • Ejiri, H
  • Elliott, SR
  • Gilliss, T
  • Giovanetti, GK
  • Green, MP
  • Gruszko, J
  • Guinn, IS
  • Guiseppe, VE
  • Haufe, CR
  • Hegedus, RJ
  • Hehn, L
  • Henning, R
  • Aguilar, D Hervas
  • 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
  • Vasundhara
  • White, BR
  • Wilkerson, JF
  • Wiseman, C
  • Xu, W
  • Yakushev, E
  • Yu, C-H
  • Yumatov, V
  • Zhitnikov, I
  • Zhu, BX
  • et al.

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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