Analytic expressions for alpha decay half-lives and potential barriers

From an adjustment on a recent selected data set of partial α-decay half-lives of 344 ground state to ground state transitions, analytical formulas are proposed for log10T1/2(s) depending or not on the angular momentum of the α particle. In par-ticular, an expression allows to reproduce precisely the partial α-decay half-lives of even-even heavy nuclei and, then, to predict accurately the partial α-decay half-lives of other very heavy elements from the experimental or predicted Qα. Comparisons have been done with other empirical approaches. Moreover, the potential barrier against α-decay or α-capture has been determined within a liquid drop model in-cluding a proximity energy term. Simple expressions are provided to calculate the potential barrier radius and height. PACS: 23.60.+e, 21.10.T