The Majorana Demonstrator is an ultra-low background experiment searching for Neutrinoless double-beta decay in 76Ge. 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 x 1025 yr for the decay 76Ge(ppn) ? 73Zn e+pi+ and 4:7 x 1025 yr for the decay 76Ge(ppp)! 73Cu e+pi+pi+. The half-life limit for the invisible tri-proton decay mode of 76Ge was found to be 7:5 x 1024 yr.
Published: February 3, 2022
Citation
Alvis S.I., I.J. Arnquist, F.T. Avignone, A.S. Barabash, C.J. Barton, V. Basu, and F.E. Bertrand, et al. 2019.Search for trinucleon Decay in the Majorana Demonstrator.Physical Review D 99, no. 7:Art. No. 072004.PNNL-SA-140170.doi:10.1103/PhysRevD.99.072004