Study of the Effect of Newly Calculated Phase Space Factor on β-Decay Half-Lives

Abstract EN

We present results for β -decay half-lives based on a new recipe for calculation of phase space factors recently introduced.

Our study includes f p -shell and heavier nuclei of experimental and astrophysical interests.

The investigation of the kinematics of some β -decay half-lives is presented, and new phase space factor values are compared with those obtained with previous theoretical approximations.

Accurate calculation of nuclear matrix elements is a prerequisite for reliable computation of β -decay half-lives and is not the subject of this paper.

This paper explores if improvements in calculating the β -decay half-lives can be obtained when using a given set of nuclear matrix elements and employing the new values of the phase space factors.

Although the largest uncertainty in half-lives computations come from the nuclear matrix elements, introduction of the new values of the phase space factors may improve the comparison with experiment.

The new half-lives are systematically larger than previous calculations and may have interesting consequences for calculation of stellar rates.