Hagino+et+al_2018_J._Phys._G%3A_Nucl._Part._Phys._10.1088_1361-6471_aadeb1.pdf (518.73 kB)
Branching ratios for deexcitation processes of daughter nuclei following invisible dinucleon decays in 16O
journal contribution
posted on 2023-06-20, 14:17 authored by K Hagino, Martti NirkkoVarious 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.
Funding
Sussex Experimental Particle Physics 2015 Consolidated Grant; G1763; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/N000307/1
History
Publication status
- Published
File Version
- Accepted version
Journal
Journal of Physics G: Nuclear and Particle PhysicsISSN
0954-3899Publisher
IOP PublishingExternal DOI
Issue
10Volume
45Page range
105105 1Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-09-07First Open Access (FOA) Date
2019-09-04First Compliant Deposit (FCD) Date
2018-09-05Usage metrics
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