出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Resonant spin-flavour (RSF) conversions of supernova neutrinos, which are
induced by the interaction between the nonzero neutrino magnetic moment and supernova
magnetic elds, are studied for both normal and inverted mass hierarchy. As the case
for the pure matter-induced neutrino oscillation (Mikheyev{Smirnov{Wolfenstein (MSW)
e
ect), we nd that the RSF transitions are strongly dependent on the neutrino mass
hierarchy as well as the value of 13. Flavour conversions are solved numerically for
various neutrino parameter sets, with the realistic presupernova pro le. In particular,
it is very interesting that the RSF-induced e ! e transition occurs if the following
conditions are all satis ed: the value of B ( is the neutrino magnetic moment and
B is the magnetic eld strength) is suciently strong, the neutrino mass hierarchy is
inverted, and the value of 13 is large enough to induce adiabatic MSW resonance. In
this case, the strong peak due to the original e emitted from the neutronization burst
would exist in the time pro le of the neutrino events detected at the Super-Kamiokande
detector. If this peak were observed in reality, it would provide fruitful information on
the neutrino properties. On the other hand, the characteristics of the neutrino spectra
are also di
erent between the neutrino models, but we nd that there remains degeneracy
among several models. This contribution is based on our recent study [1].
