Regular Article - Theoretical Physics
Alpha decay of 184-224Bi isotopes from the ground state and isomeric state
School of Pure and Applied Physics, Kannur University, Swami Anandatheertha Campus, Payyanur, 670 327, Kerala, India
Revised: 19 October 2013
Accepted: 15 November 2013
Published online: 3 December 2013
The -decay half-lives for the favored and unfavored transitions of the isotopes of Bi (Z = 83 nuclei in the region , from both the ground state (g.s.) and the isomeric state (i.s.) have been studied systematically within the Coulomb and proximity potential model (CPPM). The half-lives have been evaluated using the experimental Q-values. The computed half-lives are compared with the experimental data and they are in good agreement. We have modified the assault frequency and redetermined the half-lives and they show a better agreement with the experimental value. The standard deviation of the logarithm of the half-life with the former assault frequency is found to be 1.234 and with the modified assault frequency, it is found to be 0.935. This reveals that the CPPM, with the modified deformation-dependent assault frequency is more apt for the alpha-decay studies. Using our model we could also demonstrate the influence of the N = 126 , neutron shell closure in both parent and daughter nuclei on the alpha-decay half-lives.
© SIF, Springer-Verlag Berlin Heidelberg, 2013