Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory

Aharmim, B, Ahmed, S N, Anthony, A E, Barros, N, Beier, E W, Bellerive, A, Beltran, B, Bergevin, M, Biller, S D, Bonventre, R, Boujemline, K, Boulay, M G, Cai, B, Callaghan, E J, Caravaca, J, Peeters, S J M, SNO Collaboration, and others, (2019) Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory. Physical Review D, 99 (11). 112007-1-19. ISSN 2470-0010

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Abstract

Neutron production in giga electron volt–scale neutrino interactions is a poorly studied process. We have measured the neutron multiplicities in atmospheric neutrino interactions in the Sudbury Neutrino Observatory experiment and compared them to the prediction of a Monte Carlo simulation using GENIEand a minimally modified version of GEANT4. We analyzed 837 days of exposure corresponding to Phase I, using pure heavy water, and Phase II, using a mixture of Cl in heavy water. Neutrons produced in atmospheric neutrino interactions were identified with an efficiency of 15.3% and 44.3%, for Phases I and II respectively. The neutron production is measured as a function of the visible energy of the neutrino interaction and, for charged current quasielastic interaction candidates, also as a function of the neutrino energy. This study is also performed by classifying the complete sample into two pairs of event categories: charged current quasielastic and non charged current quasielastic, and νμ and νe. Results show good overall agreement between data and Monte Carlo for both phases, with some small tension with a statistical significance below 2σ for some intermediate energies.

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 > QC Physics
Depositing User: Alice Jackson
Date Deposited: 28 May 2019 12:47
Last Modified: 01 Jul 2019 12:15
URI: http://sro.sussex.ac.uk/id/eprint/83962

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