ELECTRON NEUTRINO MASS MEASUREMENT BY SUPERNOVA NEUTRINO BURSTS AND IMPLICATIONS FOR HOT DARK-MATTER

We present a new strategy for measuring the electron neutrino mass (m( nu e)) by future detection of a Galactic supernova in large undergroun d detectors such as Super-Kamiokande. This method is nearly model inde pendent, and one can get a mass constraint in a straightforward way fr om experimental data without specifying any model parameters for profi les of supernova neutrinos. We have tested this method using virtual d ata. It is shown that the method is sensitive to m(nu e) of similar to 3 eV for a Galactic supernova, and this range is as low as the predic tion of the cold+hot dark matter scenario with a nearly degenerate mas s hierarchy of neutrinos.