Real-time, directional measurement ofB<mml:mprescripts/>8solar neutrinos in the Kamiokande II detector

1991/10/15 by Keiko Hirata, K. Inoue, Toru Ishida +35 · 22 citations
Physics and Astronomy · #Neutrino Physics Research #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena

paper · doi:10.1103/physrevd.44.2241

openalex publication_date 1991/10/15 · openalex created_date 2023/03/19 · openalex updated_date 2026/07/28

Abstract

The method of ⁸B solar-neutrino measurement by means of the reaction \ensuremathν_ee\ensuremath→\ensuremathν_ee 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 ⁸B solar neutrinos from the subsamples of 450 days at electron energy threshold E_e\ensuremath≥9.3 MeV, and 590 days at E_e\ensuremath≥7.5 MeV relative to calculations of the ⁸B flux based on the standard solar model are 0.46\ifmmode±\else\textpm\fi0.05(stat)\ifmmode±\else\textpm\fi0.06(syst) times the prediction of Bahcall and Ulrich, and 0.70\ifmmode±\else\textpm\fi0.08(stat)\ifmmode±\else\textpm\fi0.09(syst) times the prediction of Turck-Chi\`eze 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 ⁸B \ensuremathβ decay and the cross section for \ensuremathν_ee\ensuremath→\ensuremathν_ee scattering. Within the statistical error, there is no evidence in the solar-neutrino signal for a significant time variation.

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