Search for invisible modes of nucleon decay in water with the SNO+ detector

Back, A R, Clark, K J, Falk, E, Hartnell, J, Lefeuvre, G M, Leming, E J, Mlejnek, M, Mottram, M J, Nirkko, M, Peeters, S J M, Rigan, M, Sinclair, J R, Stringer, M I, Waterfield, J, White, R F, The SNO+ Collaboration, and others, (2019) Search for invisible modes of nucleon decay in water with the SNO+ detector. Physical Review D, 99 (3). 032008 1-13. ISSN 2470-0010

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Abstract

This paper reports results from a search for nucleon decay through invisible modes, where no visible energy is directly deposited during the decay itself, during the initial water phase of SNO+. However, such decays within the oxygen nucleus would produce an excited daughter that would subsequently deexcite, often emitting detectable gamma rays. A search for such gamma rays yields limits of 2.5×1029  y at 90% Bayesian credibility level (with a prior uniform in rate) for the partial lifetime of the neutron, and 3.6×1029  y for the partial lifetime of the proton, the latter a 70% improvement on the previous limit from SNO. We also present partial lifetime limits for invisible dinucleon modes of 1.3×1028  y for nn, 2.6×1028  y for pn and 4.7×1028  y for pp, an improvement over existing limits by close to 3 orders of magnitude for the latter two.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science
Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 28 Jan 2019 13:06
Last Modified: 01 Jul 2019 19:47
URI: http://sro.sussex.ac.uk/id/eprint/81456

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Project NameSussex Project NumberFunderFunder Ref
Optical Calibration Development for SNO+G0753STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/J001007/1
Sussex Experimental Particle Physics 2015 Consolidated GrantG1763STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/N000307/1
Consolidated GrantG0927STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/K001329/1
Sussex EPP Rolling Grant 2009G0332STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/H000887/2
Marie Curie Actions Intra-European Fellowship (IEF)UnsetUnsetFP7-PEOPLE-2009-IEF