NEUTRINO MASS AND SUPERNOVA 1987A

If the rest mass of electron neutrinos is non-zero, the arrival times of neutrinos emitted from supernova 1987a will be dispersed due to the dependence of neutrino speed on their energy. By using this effect, an upper limit of the neutrino mass, 5-10eV/c², can be derived from the data of neutrinos recorded by Mont Blanc neutrino observatory.