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A neutrino mass matrix is considered under conditions of a CP invariance anda small reactor mixing $\theta_{13}$ angle. Absolute mass values for threeneutrinos are evaluated for normal and inverted hierarchy spectra on the groundof data for oscillation mixing neutrino parameters and an effective neutrinomass $m_{\beta\beta}$ related to a probability of neutrinoless two beta decay.

Evaluation of neutrino masses from $m_{\beta\beta}$ values