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 cannnot exceed the SSM estimate by more than a factor three. If one makes the additional hypothesis that hep neutrino production occurs where the He-3 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. (C) 1998 Elsevier Science B.V. All rights reserved.
|Autori interni:||DEGL'INNOCENTI, SCILLA|
|Autori:||Fiorentini G; Berezinsky V; Degl'Innocenti S; Ricci B|
|Titolo:||Bounds on hep neutrinos|
|Anno del prodotto:||1998|
|Digital Object Identifier (DOI):||10.1016/S0370-2693(98)01417-8|
|Appare nelle tipologie:||1.1 Articolo in rivista|