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

SNO+ Collaboration, :, A. Allega, M. R. Anderson, S. Andringa, M. Askins, D. J. Auty, A. Bacon, J. Baker, 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, V. Howard, B. Hreljac, J. Hu, P. Huang, R. Hunt-Stokes, S. M. A. Hussain, A. S. Inácio, C. J. Jillings, S. Kaluzienski, T. Kaptanoglu, H. Khan, 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, A. Molina Colina, 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, J. Smith, R. Svoboda, B. Tam, J. Tseng, E. Vázquez-Jáuregui, J. G. C. Veinot, C. J. Virtue, M. Ward, J. J. Weigand, J. R. Wilson, J. D. Wilson, A. Wright, S. Yang, M. Yeh, Z. Ye, S. Yu, Y. Zhang, K. Zuber, A. Zummo
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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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利用全 SNO+ 水相测量 $^8$B 太阳中微子通量
SNO+ 探测器最初是作为水切伦科夫探测器运行的。在采集水数据的中途采用了密封盖气系统,从而显著降低了探测器中^{222}$Rn子的活性,并使5兆电子伏特以上的太阳电子散射信号的背景达到了迄今为止的最低水平。本文报告了最新的SNO+水相^8$B太阳中微子分析结果,其总有效时间为282.4天,分析阈值为3.5MeV。假定没有中微子振荡,$^8$B太阳中微子通量为$left(2.32^{+0.18}_{-0.17}\text{(stat.)}^{+0.07}_{-0.05}\text{(syst.)}right)/times10^{6}$cm$^{-2}$s$^{-1}$,或者$left(5.36^{+0.41}_{-0.39}text{(stat.)}^{+0.17}_{-0.16}text{(syst.)}right)(times10^{6}$ cm$^{-2}$s$^{-1}$假设标准中微子振荡参数,与之前的测量结果和标准太阳模型计算结果都很一致。在 3.5MeV 以上呈现了电子反冲谱。
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