2019 journal article

Search for trinucleon decay in the MAJORANA DEMONSTRATOR

PHYSICAL REVIEW D, 99(7).

By: S. Alvis, I. Arnquist, F. Avignone, A. Barabash, C. Barton, V. Basu, F. Bertrand, B. Bos ...

Source: Web Of Science
Added: May 6, 2019

The Majorana Demonstrator is an ultra-low-background experiment searching for neutrinoless double-beta decay in $^{76}\mathrm{Ge}$. 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 trinucleon decay-specific modes and invisible decay modes for Ge isotopes. We find a half-life limit of $4.9\ifmmode\times\else\texttimes\fi{}{10}^{25}\text{ }\text{ }\mathrm{yr}$ for the decay $^{76}\mathrm{Ge}(\mathrm{ppn})\ensuremath{\rightarrow}^{73}\mathrm{Zn}$ ${e}^{+}{\ensuremath{\pi}}^{+}$ and $4.7\ifmmode\times\else\texttimes\fi{}{10}^{25}\text{ }\text{ }\mathrm{yr}$ for the decay $^{76}\mathrm{Ge}(\mathrm{ppp})\ensuremath{\rightarrow}^{73}\mathrm{Cu}$ ${e}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$. The half-life limit for the invisible triproton decay mode of $^{76}\mathrm{Ge}$ was found to be $7.5\ifmmode\times\else\texttimes\fi{}{10}^{24}\text{ }\text{ }\mathrm{yr}$.