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Measurement of the 8B solar neutrino flux in SNO+ with very low backgrounds

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journal contribution
posted on 2023-06-12, 09:00 authored by M Anderson, S Andringa, S Asahi, M Askins, D J Auty, N Barros, D Bartlett, F Barão, Elisabeth FalkElisabeth Falk, Jeff HartnellJeff Hartnell, M Mlejnek, Martti Nirkko, Simon PeetersSimon Peeters, Michal RiganMichal Rigan, M I Stringer, SNO+ Collaboration, others
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

2470-0010

Publisher

American Physical Society

Issue

1

Volume

99

Page range

012012 1-7

Department 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

2019-02-11

First Open Access (FOA) Date

2019-02-11

First Compliant Deposit (FCD) Date

2019-02-07

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