Measurement of the 88 solar neutrino flux in SNO+ with very low backgrounds

Anderson, M, Andringa, S, Asahi, S, Askins, M, Falk, E, Hartnell, J, Mlejnek, M, Nirkko, M, Peeters, S, Rigan, M, Stringer, M I and SNO+ Collaboration, (2019) Measurement of the 88 solar neutrino flux in SNO+ with very low backgrounds. Physical Review D, 99 (1). 012012 1-7. ISSN 2470-0010

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Abstract

A measurement of the 8B solar neutrino flux has been made using a 69.2 kt-day dataset acquired with the SNO+ detector during its water commissioning phase. At energies above 6 MeV the dataset is an extremely pure sample of solar neutrino elastic scattering events, owing primarily to the detector’s deep location, allowing an accurate measurement with relatively little exposure. In that energy region the best fit background rate is 0.25+0.09−0.07  events/kt−day, significantly lower than the measured solar neutrino event rate in that energy range, which is 1.03+0.13−0.12  events/kt−day. Also using data below this threshold, down to 5 MeV, fits of the solar neutrino event direction yielded an observed flux of 2.53+0.31−0.28(stat)+0.13−0.10(syst)×106  cm−2 s−1, assuming no neutrino oscillations. This rate is consistent with matter enhanced neutrino oscillations and measurements from other experiments.

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: 11 Feb 2019 10:41
Last Modified: 07 Mar 2019 16:11
URI: http://srodev.sussex.ac.uk/id/eprint/81818

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