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Superkamiokande and solar antineutrinos

G. Fiorentini·M. Moretti·F. L. Villante
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Abstract

We propose to exploit the angular distribution of the positrons emitted in the inverse beta decay to extract a possible antineutrino signal from the Superkamiokande background. From the statistics collected in just 101.9 days one obtains a model independent upper bound on the antineutrino flux (for energy greater than 8.3 MeV) Phi < 9*10^4 cm^-2 s^-1 at the 95% C.L. By assuming the same energy spectrum as for the 8B neutrinos, the 95% C.L. bound is Phi < 6*10^4 cm^-2 s^-1. Within three years of data taking, the sensitivity to neutrino-antineutrino transition probability will reach the 1% level, thus providing a stringent test of hybrid oscillation models.

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G. Fiorentini, M. Moretti, F. L. Villante. 1997-07-08. Superkamiokande and solar antineutrinos. https://doi.org/10.1016/s0370-2693(97)01123-4

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