Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-09-04
Int.J.Mod.Phys. D5 (1996) 519-528
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 3 postscript figures included
Scientific paper
10.1142/S0218271896000321
We investigate to what extent the oscillation or conversion of neutrinos enhances the expected event rate of the supernova relic neutrino background (SRN) at the Super-Kamiokande detector (SK). The SRN \bar\nu_e's can be almost completely exchanged with \nu_\mu-like neutrinos by the MSW oscillation under the inverse mass hierarchy with \Delta m^2 ~ 10^{-8}--10^5 [eV^2], or by the magnetic moment of Majorana neutrinos with \mu_\nu >~ 10^{-12} \mu_B and \Delta m^2 ~ 10^{-4}--10^0 [eV^2]. In the standard calculation of the SRN flux, the event rate of the SRN \bar\nu_e's at the SK in the observable energy range of 15--40 MeV can be enhanced from 1.2 yr^{-1} to 2.4 yr^{-1} if all \bar\nu_e's are exchanged with \nu_\mu-like neutrinos. The enhancement is prominent especially in the high energy range (\gtilde 25 MeV). In the astrophysically optimistic calculation, the event rate becomes as high as 9.4 yr^{-1}. Because the theoretical upper bound of the SRN events without oscillation is about 5 yr^{-1} taking account of the various astrophysical uncertainties, we might have to resort to the neutrino oscillation if more than 5 events in a year, as well as a significantly harder spectrum, were observed in the SK.
Sato Katsuhiko
Totani Tomonori
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