2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48685Core-collapse supernovae emit of order $10^{58}$ neutrinos and antineutrinos of all flavors over several seconds, with average energies of 10--25 MeV. In the Sudbury Neutrino Observatory (SNO), a future Galactic supernova at a distance of 10 kpc would cause several hundred events. The $ν_μ$ and $ν_τ$ neutrinos and antineutrinos are of particular interest, as a test of the supernova mechanism. In addition, it is possible to measure or limit their masses by their delay (determined from neutral-current events) relative to the $\barν_e$ neutrinos (determined from charged-current events). Numerical results are presented for such a future supernova as seen in SNO. Under reasonable assumptions, and in the presence of the expected counting statistics, a $ν_μ$ or $ν_τ$ mass down to about 30 eV can be simply and robustly determined. This seems to be the best technique for direct measurement of these masses.8 pages including two figures. Invited talk at the 22nd Symposium on Nuclear Physics, Oaxtepec, Morelos, Mexico, 5-8 Jan. 1999High Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - ExperimentNuclear ExperimentNuclear Theorytext