# Measurement of the B-8 solar neutrino flux in SNO plus with very low backgrounds

Anderson, M, Andringa, S, Asahi, S, Askins, M, Auty, DJ, Barros, N, Bartlett, D, Barao, F, Bayes, R, Beier, EW
et al (show 112 more authors) (2019) Measurement of the B-8 solar neutrino flux in SNO plus with very low backgrounds. PHYSICAL REVIEW D, 99 (1). 012012-.

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## Abstract

A measurement of the $^8$B 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.)$\times10^6$ 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 7 pages, 4 figures hep-ex, hep-ex Symplectic Admin 25 Feb 2019 09:52 19 Jan 2023 01:01 10.1103/PhysRevD.99.012012 https://journals.aps.org/prd/abstract/10.1103/Phys... https://livrepository.liverpool.ac.uk/id/eprint/3033373