Bounds on hep neutrinos

Abstract

The excess of highest energy solar-neutrino events recently observed by Superkamiokande can be in principle explained by anomalously high $hep$-neutrino flux ${\Phi }_{\nu }(hep)$. Without using SSM calculations, from the solar luminosity constraint we derive that ${\Phi }_{\nu }(hep)/S_{13}$ cannot exceed the SSM estimate by more than a factor three. If one makes the additional hypothesis that $hep$ neutrino production occurs where the ${}^3$He concentration is at equilibrium, helioseismology gives an upper bound which is (less then) two times the SSM prediction. We argue that the anomalous $hep$-neutrino flux of order of that observed by Superkamiokande cannot be explained by astrophysics, but rather by a large production cross-section.

7 pages, RevTeX file

References in corpus (1)

• Boron abundance and solar neutrino spectrum distortion

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