Simple Formula of β+-Decay Half-Lives of Nuclei Far From β-Stable Line

We generalize the formula of β+-decay half-lives [Phys. Rev. C 73 (2006) 014305] to include all available data of nuclei far from the β-stable line. Good agreement with experimental data is obtained by taking into account the even-odd (e-o) effect. It is shown that the e-o effect on β+-decay half-life is apparent for the allowed β+-transition, whereas it is not apparent for the first and second forbidden transitions. This demonstrates that the allowed β+-transition is more sensitive to the nuclear even-odd effect than the forbidden β+-transition. The underlying physics is discussed. This formula can be used to predict the β+-decay half-lives of the nuclei far from β-stability. It is useful to experimental physicists for analyzing the data of β+-decay.