Search for trinucleon decay in the MAJORANA DEMONSTRATOR...

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 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 76Ge(ppn)→73Zn e+π+ and 4.7×1025  yr for the decay 76Ge(ppp)→73Cu e+π+π+. The half-life limit for the invisible triproton decay mode of 76Ge was found to be 7.5×1024  yr.