2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43620It is demonstrated that the observation of neutrino oscillations in the atmospheric (K2K) neutrino experiments and unitarity of the mixing matrix implies that disappearance of the reactor $\barν_{e}$'s discovered in the KamLAND experiment is due to $\barν_{e}\to \barν_μ$ {\em and} $\barν_{e}\to \barν_τ$ transitions. At $θ_{23}=π/4$ the probabilities of these transitions are equal.High Energy Physics - Phenomenologytext