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.
Bounds on hep neutrinos
DEGL'INNOCENTI, SCILLA;
1998-01-01
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 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
