Branching ratios for deexcitation processes of daughter nuclei following invisible dinucleon decays in 16O

Nirkko, Martti and Hagino, Kouichi (2018) Branching ratios for deexcitation processes of daughter nuclei following invisible dinucleon decays in 16O. Journal of Physics G: Nuclear and Particle Physics. ISSN 0954-3899

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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 1s1/2 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 MeV and 7.01 MeV gamma-rays from 14C, and 6.45 MeV and 7.03 MeV gamma-rays from 14N, have branching ratios as large as 10.9%, 20.1%, 7.73% and 8.90%, respectively.

Item Type: Article
Keywords: invisible decays, branching ratios, statistical model, gamma-ray emissions
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity
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Depositing User: Martti Nirkko
Date Deposited: 07 Sep 2018 08:21
Last Modified: 12 Sep 2018 08:26

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Project NameSussex Project NumberFunderFunder Ref
Sussex Experimental Particle Physics 2015 Consolidated GrantG1763STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/N000307/1