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arXiv · 2407.17595

Measurement of the $^8$B Solar Neutrino Flux Using the Full SNO+ Water Phase Dataset

SNO+ Collaboration·:·A. Allega·M. R. Anderson·S. Andringa·M. Askins·D. M. Asner·D. J. Auty·A. Bacon·F. Barão·N. Barros·R. Bayes·E. W. Beier·A. Bialek·S. D. Biller·E. Blucher·E. Caden·E. J. Callaghan·M. Chen·S. Cheng·B. Cleveland·D. Cookman·J. Corning·M. A. Cox·R. Dehghani·J. Deloye·M. M. Depatie·F. Di Lodovico·C. Dima·J. Dittmer·K. H. Dixon·M. S. Esmaeilian·E. Falk·N. Fatemighomi·R. Ford·A. Gaur·O. I. González-Reina·D. Gooding·C. Grant·J. Grove·S. Hall·A. L. Hallin·D. Hallman·W. J. Heintzelman·R. L. Helmer·C. Hewitt·B. Hreljac·J. Hu·P. Huang·R. Hunt-Stokes·S. M. A. Hussain·A. S. Inácio·C. J. Jillings·S. Kaluzienski·T. Kaptanoglu·J. Kladnik·J. R. Klein·L. L. Kormos·B. Krar·C. Kraus·C. B. Krauss·T. Kroupová·C. Lake·L. Lebanowski·C. Lefebvre·V. Lozza·M. Luo·A. Maio·S. Manecki·J. Maneira·R. D. Martin·N. McCauley·A. B. McDonald·G. Milton·D. Morris·M. Mubasher·S. Naugle·L. J. Nolan·H. M. O'Keeffe·G. D. Orebi Gann·J. Page·K. Paleshi·W. Parker·J. Paton·S. J. M. Peeters·L. Pickard·B. Quenallata·P. Ravi·A. Reichold·S. Riccetto·J. Rose·R. Rosero·I. Semenec·J. Simms·P. Skensved·M. Smiley·R. Svoboda·B. Tam·J. Tseng·E. Vázquez-Jáuregui
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Abstract

The SNO+ detector operated initially as a water Cherenkov detector. The implementation of a sealed covergas system midway through water data taking resulted in a significant reduction in the activity of $^{222}$Rn daughters in the detector and allowed the lowest background to the solar electron scattering signal above 5 MeV achieved to date. This paper reports an updated SNO+ water phase $^8$B solar neutrino analysis with a total livetime of 282.4 days and an analysis threshold of 3.5 MeV. The $^8$B solar neutrino flux is found to be $\left(2.32^{+0.18}_{-0.17}\text{(stat.)}^{+0.07}_{-0.05}\text{(syst.)}\right)\times10^{6}$ cm$^{-2}$s$^{-1}$ assuming no neutrino oscillations, or $\left(5.36^{+0.41}_{-0.39}\text{(stat.)}^{+0.17}_{-0.16}\text{(syst.)} \right)\times10^{6}$ cm$^{-2}$s$^{-1}$ assuming standard neutrino oscillation parameters, in good agreement with both previous measurements and Standard Solar Model Calculations. The electron recoil spectrum is presented above 3.5 MeV.

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SNO+ Collaboration, :, A. Allega, M. R. Anderson, S. Andringa, M. Askins, D. M. Asner, D. J. Auty, A. Bacon, F. Barão, N. Barros, R. Bayes, E. W. Beier, A. Bialek, S. D. Biller, E. Blucher, E. Caden, E. J. Callaghan, M. Chen, S. Cheng, B. Cleveland, D. Cookman, J. Corning, M. A. Cox, R. Dehghani, J. Deloye, M. M. Depatie, F. Di Lodovico, C. Dima, J. Dittmer, K. H. Dixon, M. S. Esmaeilian, E. Falk, N. Fatemighomi, R. Ford, A. Gaur, O. I. González-Reina, D. Gooding, C. Grant, J. Grove, S. Hall, A. L. Hallin, D. Hallman, W. J. Heintzelman, R. L. Helmer, C. Hewitt, B. Hreljac, J. Hu, P. Huang, R. Hunt-Stokes, S. M. A. Hussain, A. S. Inácio, C. J. Jillings, S. Kaluzienski, T. Kaptanoglu, J. Kladnik, J. R. Klein, L. L. Kormos, B. Krar, C. Kraus, C. B. Krauss, T. Kroupová, C. Lake, L. Lebanowski, C. Lefebvre, V. Lozza, M. Luo, A. Maio, S. Manecki, J. Maneira, R. D. Martin, N. McCauley, A. B. McDonald, G. Milton, D. Morris, M. Mubasher, S. Naugle, L. J. Nolan, H. M. O'Keeffe, G. D. Orebi Gann, J. Page, K. Paleshi, W. Parker, J. Paton, S. J. M. Peeters, L. Pickard, B. Quenallata, P. Ravi, A. Reichold, S. Riccetto, J. Rose, R. Rosero, I. Semenec, J. Simms, P. Skensved, M. Smiley, R. Svoboda, B. Tam, J. Tseng, E. Vázquez-Jáuregui. 2024-07-24. Measurement of the $^8$B Solar Neutrino Flux Using the Full SNO+ Water Phase Dataset. https://doi.org/10.1103/physrevd.110.122003

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