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

Anderson, M. and Andringa, S. and Asahi, S. and Askins, M. and Auty, D. J. and Barros, N. and Bartlett, D. and Barao, F. and Bayes, R. and Beier, E. W. and Bialek, A. and Biller, S. D. and Blucher, E. and Bonventre, R. and Boulay, M. and Caden, E. and Callaghan, E. J. and Caravaca, J. and Chauhan, D. and Chen, M. and Chkvorets, O. and Cleveland, B. and Connors, C. and Coulter, I. T. and Depatie, M. M. and Di Lodovico, F. and Duncan, F. and Dunger, J. and Falk, E. and Fischer, V. and Fletcher, E. and Ford, R. and Gagnon, N. and Gilje, K. and Grant, C. and Grove, J. and Hallin, A. L. and Hallman, D. and Hans, S. and Hartnell, J. and Heintzelman, W. J. and Helmer, R. L. and Hernandez-Hernandez, J. L. and Hreljac, B. and Hu, J. and Inacio, A. S. and Kormos, L. L. and O'Keeffe, H. M. and Parnell, M. J. and Peeters, S. J. M. (2019) Measurement of the B-8 solar neutrino flux in SNO plus with very low backgrounds. Physical Review D, 99 (1). ISSN 2470-0010

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A measurement of the B-8 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 tit 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, don to 5 MeV, fits of the solar neutrino event direction yielded an observed flux of 2.51(-0.28)(+0.31)(stat)(-0.10)(+0.13)(syst) x 10(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: Journal Article
Journal or Publication Title: Physical Review D
Departments: Faculty of Science and Technology > Physics
ID Code: 131261
Deposited By: ep_importer_pure
Deposited On: 14 Feb 2019 12:00
Refereed?: Yes
Published?: Published
Last Modified: 22 Feb 2020 04:58

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