We analyze the neutrino conversions inside a supernova in the 3$\nu$ mixing scheme, and their effects on the neutrino spectra observed at the earth. We find that the observations of the energy spectra of neutrinos from a future galactic supernova may enable us to identify the solar neutrino solution, to determine the sign of $\Delta m^2_{ 32}$, and to probe the mixing matrix element |U_{ e3}|^2 to values as low as 10^{ -4}-10^{ -3}.
Categories: hep-ph