Electron Neutrino Mass Measurement by Supernova Neutrino Bursts and Implications on Hot Dark Matter

摘要

We present a new strategy for measuring the electron neutrino mass ($\mnue$)by future detection of a Galactic supernova in large underground detectors suchas the Super-Kamiokande (SK). This method is nearly model-independent and onecan get a mass constraint in a straightforward way from experimental datawithout specifying any model parameters for profiles of supernova neutrinos. Wehave tested this method using virtual data generated from a numerical model ofsupernova neutrino emission by realistic Monte-Carlo simulations of the SKdetection. It is shown that this method is sensitive to $\mnue$ of $\sim$ 3 eVfor a Galactic supernova, and this range is as low as the prediction of thecold+hot dark matter scenario with a nearly degenerate mass hierarchy ofneutrinos, which is consistent with the current observations of solar andatmospheric neutrino anomalies and density fluctuations in the universe.