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Current status of the solar neutrino problem with Super-Kamiokande

Abstract:

We perform an updated model-independent analysis using the latest solar neutrino data obtained by 37Cl and 71Ga radiochemical experiments, and most notably by a large water-Cherenkov detector SuperKamiokande with their 504 days of data taking. We confirm that the astrophysical solutions to the solar neutrino problem are extremely disfavored by the data and a low-temperature modification of the standard solar model is excluded by more than 5 σ. We also propose a new way of illuminating the suppression pattern of various solar neutrino fluxes without invoking detailed flavor conversion mechanisms. It indicates that the strong suppression of 7Be neutrinos is no more true when the neutrino flavor conversion is taken into account. ©1999 The American Physical Society.