Measurement of the B8 solar neutrino flux in SNO+ with very low backgrounds

Anderson, M.; Andringa, S.; Asahi, S.; Askins, M.; Auty, D. J.; Barros, N.; Bartlett, D.; Barão, F.; Bayes, R.; Beier, E. W.; Bialek, A.; Biller, S. D.; Blucher, E.; Bonventre, R.; Boulay, M.; Caden, E.; Callaghan, E. J.; Caravaca, J.; Chauhan, D.; Chen, M.; Chkvorets, O.; Cleveland, B.; Connors, C.; Coulter, I. T.; Depatie, M. M.; Di Lodovico, F.; Duncan, F.; Dunger, J.; Falk, E.; Fischer, V.; Fletcher, E.; Ford, R.; Gagnon, N.; Gilje, K.; Grant, C.; Grove, J.; Hallin, A. L.; Hallman, D.; Hans, S.; Hartnell, J.; Heintzelman, W. J.; Helmer, R. L.; Hernández-Hernández, J. L.; Hreljac, B.; Hu, J.; Inácio, A. S.; Jillings, C. J.; Kaptanoglu, T.; Khaghani, P.; Klein, J. R.; Knapik, R.; Kormos, L. L.; Krar, B.; Kraus, C.; Krauss, C. B.; Kroupova, T.; Lam, I.; Land, B. J.; Lane, R.; LaTorre, A.; Lawson, I.; Lebanowski, L.; Leming, E. J.; Li, A.; Lidgard, J.; Liggins, B.; Liu, Y.; Lozza, V.; Luo, M.; Maguire, S.; Maio, A.; Manecki, S.; Maneira, J.; Martin, R. D.; Marzec, E.; Mastbaum, A.; McCauley, N.; McDonald, A. B.; Mekarski, P.; Meyer, M.; Mlejnek, M.; Morton-Blake, I.; Nae, S.; Nirkko, M.; O’Keeffe, H. M.; Orebi Gann, G. D.; Parnell, M. J.; Paton, J.; Peeters, S. J.  M.; Pershing, T.; Pickard, L.; Pracsovics, D.; Prior, G.; Reichold, A.; Richardson, R.; Rigan, M.; Rose, J.; Rosero, R.; Rumleskie, J.; Semenec, I.; Singh, K.; Skensved, P.; Stringer, M. I.; Svoboda, R.; Tam, B.; Tian, L.; Tseng, J.; Turner, E.; Van Berg, R.; Veinot, J. G.  C.; Virtue, C. J.; Vázquez-Jáuregui, E.; Wang, J.; Weigand, J. J.; Wilson, J. R.; Woosaree, P.; Wright, A.; Yanez, J. P.; Yeh, M.; Zuber, K.; Zummo, A.

doi:10.1103/PhysRevD.99.012012

Title: Measurement of the ${}^{8}B$ solar neutrino flux in $SNO +$ with very low backgrounds

Journal Article · Tue Jan 01 00:00:00 EST 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.99.012012· OSTI ID:1492472

Anderson, M.; Andringa, S.; Asahi, S.; Askins, M.; Auty, D. J.; Barros, N.; Bartlett, D.; Barão, F.; Bayes, R.; Beier, E. W.; Bialek, A.; Biller, S. D.; Blucher, E.; Bonventre, R.; Boulay, M.; Caden, E.; Callaghan, E. J.; Caravaca, J.; Chauhan, D.; Chen, M. more »

Here, 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Davis, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: $SNO +$ Collaboration

Grant/Contract Number:: AC02-05CH11231; SC0012704; SC0009999

OSTI ID:: 1492472

Alternate ID(s):: OSTI ID: 1496577; OSTI ID: 1550860; OSTI ID: 1595452

Report Number(s):: BNL-211295-2019-JAAM; PRVDAQ; 012012

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 99 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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