Effects of neutrino temperatures and mass hierarchies on the detection of supernova neutrinos

Possible outcomes of neutrino events at both Super-Kamiokande and SNO for a type-II supernova are analyzed considering the uncertainties of the neutrino spectra(temperature) at their emission, which may complicate the interpretation of the observed results. With the input of parameters deduced from the current solar and atmospheric experiments, consequences of direct-mass $m_{\nu_{\tau}} \gg m_{\nu_{\mu}} > m_{\nu_{e}}$ and inverted-mass $m_{\nu_{e}} > m_{\nu_{\mu}} \gg m_{\nu_{\tau}}$ hierarchies are investigated. Even if the $\nu$ temperatures are not precisely known, future experiments at the two detectors are likely to be able to separate the currently accepted solutions to the solar neutrino problem: large angle MSW, small angle MSW, and the vacuum oscillation, as well as to distinguish between the direct and inverted mass hierarchies of the neutrinos.