文章基本信息

标题：Neutrino oscillations in non-spherical supernova explosions
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作者：S. Kawagoe
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2008
卷号：2008
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.