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

M. Anderson1, S. Andringa2, S. Asahi1, M. Askins3,4,5, D. J. Auty6, N. Barros7, D. Bartlett1, F. Barão2,8, R. Bayes9 et al. (SNO+ Collaboration)

R. Bayes9, E. W. Beier7, A. Bialek10,6, S. D. Biller11, E. Blucher12, R. Bonventre13,5, M. Boulay1, E. Caden10,9, E. J. Callaghan13,5, J. Caravaca13,5, D. Chauhan10, M. Chen1, O. Chkvorets9, B. Cleveland10,9, C. Connors9, I. T. Coulter7, M. M. Depatie9, F. Di Lodovico14, F. Duncan10,9, J. Dunger11, E. Falk15, V. Fischer3, E. Fletcher1, R. Ford10,9, N. Gagnon10, K. Gilje6, C. Grant16, J. Grove9, A. L. Hallin6, D. Hallman9, S. Hans17, J. Hartnell15, W. J. Heintzelman7, R. L. Helmer18, J. L. Hernández-Hernández19, B. Hreljac1, J. Hu6, A. S. Inácio2,20, C. J. Jillings10,9, T. Kaptanoglu7, P. Khaghani9, J. R. Klein7, R. Knapik21, L. L. Kormos22, B. Krar1, C. Kraus9, C. B. Krauss6, T. Kroupova11, I. Lam1, B. J. Land4,5, R. Lane14, A. LaTorre12, I. Lawson10,9, L. Lebanowski7, E. J. Leming11, A. Li16, J. Lidgard11, B. Liggins14, Y. Liu1, V. Lozza2, M. Luo7, S. Maguire17, A. Maio2,20, S. Manecki1, J. Maneira2,20, R. D. Martin1, E. Marzec7, A. Mastbaum12, N. McCauley23, A. B. McDonald1, P. Mekarski6, M. Meyer24, M. Mlejnek15, I. Morton-Blake11, S. Nae2,20, M. Nirkko15, H. M. O’Keeffe22, G. D. Orebi Gann13,5, M. J. Parnell22, J. Paton11, S. J. M. Peeters15, T. Pershing3, L. Pickard3, D. Pracsovics9, G. Prior2, A. Reichold11, R. Richardson9, M. Rigan15, J. Rose23, R. Rosero17, J. Rumleskie9, I. Semenec1, K. Singh6, P. Skensved1, M. I. Stringer15, R. Svoboda3, B. Tam1, L. Tian1, J. Tseng11, E. Turner11, R. Van Berg7, J. G. C. Veinot25, C. J. Virtue9, E. Vázquez-Jáuregui19, J. Wang11, J. J. Weigand26, J. R. Wilson14, P. Woosaree9, A. Wright1, J. P. Yanez6, M. Yeh17, K. Zuber24,27, and A. Zummo7 (SNO+ Collaboration)

  • 1Queen’s University, Department of Physics, Engineering Physics & Astronomy, Kingston, Ontario K7L 3N6, Canada
  • 2Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Avenida Professor Gama Pinto, 2, 1649-003, Lisboa, Portugal
  • 3University of California, Davis, 1 Shields Avenue, Davis, California 95616, USA
  • 4University of California, Berkeley, Department of Physics, Berkeley, California 94720, USA
  • 5Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720-8153, USA
  • 6University of Alberta, Department of Physics, 4-181 CCIS, Edmonton, Alberta T6G 2E1, Canada
  • 7University of Pennsylvania, Department of Physics & Astronomy, 209 South 33rd Street, Philadelphia, Pennsylvania 19104-6396, USA
  • 8Universidade de Lisboa, Instituto Superior Técnico (IST), Departamento de Física, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
  • 9Laurentian University, Department of Physics, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6, Canada
  • 10SNOLAB, Creighton Mine #9, 1039 Regional Road 24, Sudbury, Ontario P3Y 1N2, Canada
  • 11University of Oxford, The Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, United Kingdom
  • 12The Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA
  • 13University of California, Berkeley, Department of Physics, California 94720, Berkeley, USA
  • 14Queen Mary, University of London, School of Physics and Astronomy, 327 Mile End Road, London, E1 4NS, United Kingdom
  • 15University of Sussex, Physics & Astronomy, Pevensey II, Falmer, Brighton, BN1 9QH, United Kingdom
  • 16Boston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
  • 17Brookhaven National Laboratory, Chemistry Department, Building 555, P.O. Box 5000, Upton, New York 11973-500, USA
  • 18TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 19Universidad Nacional Autónoma de México (UNAM), Instituto de Física, Apartado Postal 20-364, México D.F., 01000, México
  • 20Universidade de Lisboa, Faculdade de Ciências (FCUL), Departamento de Física, Campo Grande, Edifício C8, 1749-016 Lisboa, Portugal
  • 21Norwich University, 158 Harmon Drive, Northfield, Vermont 05663, USA
  • 22Lancaster University, Physics Department, Lancaster, LA1 4YB, United Kingdom
  • 23University of Liverpool, Department of Physics, Liverpool, L69 3BX, United Kingdom
  • 24Technische Universität Dresden, Institut für Kern und Teilchenphysik, Zellescher Weg 19, Dresden, 01069, Germany
  • 25University of Alberta, Department of Chemistry, 1-001 CCIS, Edmonton, Alberta T6G 2E9, Canada
  • 26Technische Universität Dresden, Faculty of Chemistry and Food Chemistry, 01062 Dresden, Germany
  • 27MTA Atomki, 4001 Debrecen, Hungary

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Phys. Rev. D 99, 012012 – Published 28 January, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.012012

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.

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Phys. Rev. D 99, 012012– Published 28 January, 2019
  • Received 7 December 2018
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