Effects of neutrino oscillation on the supernova neutrino spectrum - art. no. 093004

The effects of three-flavor neutrino oscillation on the supernova neutrino spectrum are studied. We calculate the expected event rate and energy spect ra, and their time evolution at SuperKamiokande (SK) and the Sudbury Neutri no Observatory (SNO) by using a realistic neutrino burst model based on num erical simulations of supernova explosions. We also employ a realistic dens ity profile based on a presupernova model for the calculation of neutrino c onversion probability in supernova envelopes. These realistic models and nu merical calculations allow us to quantitatively estimate the effects of neu trino oscillation in a more realistic way than previous studies. We then fi nd that the degeneracy of the solutions of the solar neutrino problem can b e broken by the combination of the SK and SNO detections of a future Galact ic supernova.