Branching ratios for de-excitation processes of daughter nuclei following invisible dinucleon decays in 16O

K. Hagino, M. Nirkko

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Various theories beyond the standard model of particle physics predict the existence of baryon number violating processes resulting in nucleon decay. When occurring within an atomic nucleus, such a decay will be followed by secondary decays of the daughter nucleus unless its ground state is directly populated. In this paper, we estimate branching ratios for processes associated with dinucleon decays of the 16O nucleus. To this end, we use a simple shell model for the ground state of 16O. For decays from the configuration, which result in highly excited states in the daughter nucleus, we employ a statistical model with the Hauser-Feshbach theory. Our analysis indicates that the branching ratio for gamma-ray emission in the energy range between 5 and 9 MeV, which is relevant to low-threshold water Cherenkov experiments such as SNO+, is 4.53%, 35.7%, and 20.2% for the nn, pp, and pn decays in 16O, respectively. In particular, emission of 6.09 and 7.01 MeV gamma-rays from 14C, and 6.45 and 7.03 MeV gamma-rays from 14N, have branching ratios of as large as 10.9%, 20.1%, 7.73% and 8.90%, respectively.

Original languageEnglish
Article number105105
JournalJournal of Physics G: Nuclear and Particle Physics
Volume45
Issue number10
DOIs
Publication statusPublished - 2018 Sep 14

Keywords

  • branching ratios
  • gamma-ray emissions
  • invisible decays
  • statistical model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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