2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162315We examine the survival probability for neutrino propagation through matter with variable density. We present a new method to calculate the level-crossing probability that differs from Landau's method by constant factor, which is relevant in the interpretation of neutrino flux from supernova explosion.4 pages, 1 figure, typos addedHigh Energy Physics - Phenomenologytext