出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Over the last decades, it has been observationally suggested that the core-collapse supernovae are
generally aspherical. On the other hand, most of the previous studies about the neutrino oscillation
with the predictions of the neutrino spectra have been concerned with the spherically symmetric
supernova explosions. Here we study how the explosion anisotropy affects the neutrino spectra
through the neutrino oscillation in the non-spherical supernova envelope.
In order to clarify the dependence of the neutrino spectrum in the direction, we calculate the
neutrino spectra in two typical directions of the equator and the pole, and compared them with
each other. Moreover, we predict the event rates of the supernova neutrinos to be observed in the
Super-Kamiokande by assuming a supernova at the center of Milky Way. We find that the survival
probabilities and neutrino spectra are different from one another depending on the direction
from the axis for asymmetric Type-Ic supernova explosion. The event rate of the polar direction
decreases when the shock wave is propagating the H-resonance (» 103 g/cm3). If we obtain the
inclination from axis of the supernova by optical observation, we can find the asymmetric diverse
of core explosion from the neutrino observation, and the explosion mechanism in detail.
