Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-04-05
Astropart.Phys.12:299-306,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
ReVTeX, 8 pages, 7 figures included using psfig.sty ; references and notes added
Scientific paper
10.1016/S0927-6505(99)00090-0
The excess of solar-neutrino events above 13 MeV that has been recently observed by Superkamiokande can be explained by the vacuum oscillation solution to the Solar Neutrino Problem (SNP). If the boron neutrino flux is 20% smaller than the standard solar model (SSM) prediction and the chlorine signal is assumed 30% (or 3.4 sigmas) higher than the measured one, there exists a vacuum oscillation solution to SNP that reproduces both the observed spectrum of the recoil electrons, including the high energy distortion, and the other measured neutrino rates. The most distinct signature of this solution is a semi-annual seasonal variation of the Be7 neutrino flux with maximal amplitude. While the temporal series of the GALLEX and Homestake signals suggest that such a seasonal variation could be present, future detectors (BOREXINO, LENS and probably GNO) will be able to test it.
Berezinsky Veniamin
Fiorentini Gianni
Lissia Marcello
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