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

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