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

(SNO+ Collaboration)

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A measurement of the B8 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 0.25-0.07+0.09 events/kt-day, significantly lower than the measured solar neutrino event rate in that energy range, which is 1.03-0.12+0.13 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 2.53-0.28+0.31(stat)-0.10+0.13(syst)×106 cm-2 s-1, assuming no neutrino oscillations. This rate is consistent with matter enhanced neutrino oscillations and measurements from other experiments.

Original languageEnglish (US)
Article number012012
JournalPhysical Review D
Volume99
Issue number1
DOIs
StatePublished - Jan 1 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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