Core-collapse supernovae eject huge amount of flux of energetic neutrinos which affect explosive nucleosynthesis. Several isotopes depend strongly on the neutrino flavor oscillation due to the Mikheyev-Smirnov-Wolfenstein (MSW) effect. We here discuss how to determine the neutrino temperatures and propose a novel method to determine still unknown neutrino oscillation parameters, mass hierarchy and θ₁₃, simultaneously. We also discuss supernova relic neutrinos that may indicate the softness of the equation of state of nuclear matter as well as neutrino oscillations.

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