2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42525It is shown how deviations of neutrino flavor mix from the canonical 1 : 1 : 1 in high energy astrophysical neutrinos can provide evidence for neutrino decays with lifetimes as long as $10^4 s/eV$.10 pages, Latex, presented at the Tenth International Conference on Neutrino Telescopes, Mar 11-14, 2003; Venice, ItalyHigh Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - Experimenttext