Abstract
The method of B8 solar-neutrino measurement by means of the reaction νee→νee in the Kamiokande II detector is described in detail. A data sample of 1040 live detector days in the time period January 1987 through April 1990 yields a clear directional correlation of the solar-neutrino-induced electron events with respect to the Sun and a measurement of the differential electron energy distribution. The measured flux of B8 solar neutrinos from the subsamples of 450 days at electron energy threshold Ee≥9.3 MeV, and 590 days at Ee≥7.5 MeV relative to calculations of the B8 flux based on the standard solar model are 0.46±0.05(stat)±0.06(syst) times the prediction of Bahcall and Ulrich, and 0.70±0.08(stat)±0.09(syst) times the prediction of Turck-Chièze et al. The shape of the recoil electron energy distribution is consistent with that expected from the product of the known shape of the neutrino flux from B8 β decay and the cross section for νee→νee scattering. Within the statistical error, there is no evidence in the solar-neutrino signal for a significant time variation.Received 21 June 1991DOI:https://doi.org/10.1103/PhysRevD.44.2241©1991 American Physical Society
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