Influence of nuclear isospin and angular momentum on alpha-decay half-lives

摘要

In this work the influence of isospin and angular momentum on two versions of Ren formula has been studied by adding the asymmetry and angular momentum terms for alpha-decay half-lives. We obtain coefficients for the two new formulae (New Ren A, New Ren B) and previous Ren (Ren B) formula, the coefficient are determined by least square fitting method of 356 nuclei for the even-even, even-odd, odd-even and odd-odd sets of nuclei. For each formula, the average and standard deviations have been evaluated. The new expressions provide good agreement between the calculated and experimental data for the alpha-decay half-lives when we consider the influence of nuclear isospin and angular momentum. (C) 2018 Elsevier B.V. All rights reserved.