Systematic study of $\alpha$ decay half-lives based on Gamow--like model with a screened electrostatic barrier

Abstract

In the present work we systematically study $\alpha$ decay half-lives of $Z>51$ nuclei using the modified Gamow-like model which includes the effects of the centrifugal potential and electrostatic shielding. For the case of even-even nuclei, this model contains two adjustable parameters: the parameter $a$ related to the screened electrostatic barrier and the radius constant $r_0$, while for the case of odd-odd and odd-A nuclei, it is added a new parameter i.e. hindrance factor $h$ which is used to describe the effect of an odd-proton and/or an odd-neutron. Our calculations can well reproduce the experimental data. In addition, we use this modified Gamow-like model to predict the $\alpha$-decay half-lives of seven even-even nuclei with $Z=120$ and some un-synthesized nuclei on their $\alpha$ decay chains.

30 pages, 6 figures. This paper has been accepted by Nuclear Physics, Section A

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