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

:, and Andringa, S. and Arushanova, E. and Asahi, S. and Askins, M. and Auty, D. J. and Back, A. R. and Barnard, Z. and Barros, N. and Bartlett, D. and Barão, F. and Bayes, R. and Beier, E. W. and Bialek, A. and Biller, S. D. and Blucher, E. and Bonventre, R. and Boulay, M. and Braid, D. and Caden, E. and Callaghan, E. J. and Caravaca, J. and Carvalho, J. and Cavalli, L. and Chauhan, D. and Chkvorets, O. and Clark, K. J. and Cleveland, B. and Connors, C. and Coulter, I. T. and Cressy, D. and Dai, X. and Darrach, C. and Davis-Purcell, B. and Depatie, M. M. and Descamps, F. and Lodovico, F. Di and Duhaime, N. and Duncan, F. and Dunger, J. and Falk, E. and Fatemighomi, N. and Fischer, V. and Fletcher, E. and Kormos, L. L. and O'Keeffe, H. M. and Parnell, M. J. (2019) Search for invisible modes of nucleon decay in water with the SNO+ detector. Physical Review D, 99 (3). ISSN 1550-7998

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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 de-excite, often emitting detectable gamma rays. A search for such gamma rays yields limits of $2.5 \times 10^{29}$ y at 90% Bayesian credibility level (with a prior uniform in rate) for the partial lifetime of the neutron, and $3.6 \times 10^{29}$ 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 $1.3\times 10^{28}$ y for $nn$, $2.6\times 10^{28}$ y for $pn$ and $4.7\times 10^{28}$ y for $pp$, an improvement over existing limits by close to three orders of magnitude for the latter two.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
13 pages, 6 figures
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Deposited On:
16 Jan 2019 15:40
Last Modified:
26 Sep 2020 05:45