@article{85d917272de9465daf827dace1ff4c76,
title = "Measurement of the B 8 solar neutrino flux in SNO+ with very low backgrounds",
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.",
author = "{(SNO+ Collaboration)} and M. Anderson and S. Andringa and S. Asahi and M. Askins and Auty, {D. J.} and N. Barros and D. Bartlett and F. Bar{\~a}o and R. Bayes and Beier, {E. W.} and A. Bialek and Biller, {S. D.} and E. Blucher and R. Bonventre and M. Boulay and E. Caden and Callaghan, {E. J.} and J. Caravaca and D. Chauhan and M. Chen and O. Chkvorets and B. Cleveland and C. Connors and Coulter, {I. T.} and Depatie, {M. M.} and {Di Lodovico}, F. and F. Duncan and J. Dunger and E. Falk and V. Fischer and E. Fletcher and R. Ford and N. Gagnon and K. Gilje and C. Grant and J. Grove and Hallin, {A. L.} and D. Hallman and S. Hans and J. Hartnell and Heintzelman, {W. J.} and Helmer, {R. L.} and Hern{\'a}ndez-Hern{\'a}ndez, {J. L.} and B. Hreljac and J. Hu and In{\'a}cio, {A. S.} and Jillings, {C. J.} and T. Kaptanoglu and P. Khaghani and A. Mastbaum",
note = "Funding Information: Capital construction funds for the experiment were provided by the Canada Foundation for Innovation (CFI) and matching partners. This research was supported by the following: Canada: Natural Sciences and Engineering Research Council, the Canadian Institute for Advanced Research (CIFAR), Queen{\textquoteright}s University at Kingston, Ontario Ministry of Research, Innovation and Science, Alberta Science and Research Investments Program, National Research Council, Federal Economic Development Initiative for Northern Ontario, Northern Ontario Heritage Fund Corporation, Ontario Early Researcher Awards; US: Department of Energy Office of Nuclear Physics, National Science Foundation, the University of California, Berkeley, Department of Energy National Nuclear Security Administration through the Nuclear Science and Security Consortium; UK: Science and Technology Facilities Council (STFC), the European Union{\textquoteright}s Seventh Framework Programme under the European Research Council (ERC) grant agreement, the Marie Curie grant agreement; Portugal: Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT-Portugal); Germany: the Deutsche Forschungsgemeinschaft; Mexico: DGAPA-UNAM and Consejo Nacional de Ciencia y Tecnolog{\'i}a. We thank the technical staff for their strong contributions. We would like to thank SNOLAB and its staff for support through underground space, logistical and technical services. SNOLAB operations are supported by the CFI and the Province of Ontario Ministry of Research and Innovation, with underground access provided by Vale at the Creighton mine site. This research was enabled in part by support provided by WestGRID (www.westgrid.ca) and Compute Canada (www.computecanada.ca), in particular computer systems and support from the University of Alberta (www.ualberta.ca) and from Simon Fraser University (www.sfu.ca), and by the GridPP Collaboration, in particular computer systems and support from Rutherford Appleton Laboratory . Additional high-performance computing was provided through the “Illume” cluster funded by the CFI and Alberta Economic Development and Trade (EDT) and operated by ComputeCanada and the Savio computational cluster resource provided by the Berkeley Research Computing program at the University of California, Berkeley (supported by the UC Berkeley Chancellor, Vice Chancellor for Research, and Chief Information Officer). Additional long-term storage was provided by the Fermilab Scientific Computing Division. Fermilab is managed by Fermi Research Alliance, LLC (FRA) under contract with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.",
year = "2019",
month = jan,
day = "1",
doi = "10.1103/PhysRevD.99.012012",
language = "English (US)",
volume = "99",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "1",
}