Abstract
A systematic study on the α-decay half lives of the isotopes of Bi (Z = 83) nuclei in the region 184 ≤ A ≤ 216 has been done using the Coulomb and proximity potential model (CPPM). The computed half lives are compared with the experimental data and they are in good agreement. We have modified the assault frequency and re-determined the half lives and they show a better agreement with the experimental value. The standard deviation of the logarithm of half life with the former assault frequency is found to be 1.323 and with the modified assault frequency, it is found to be 0.223. This reveals that the Coulomb and proximity potential model (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 126 neutron shell closure in both parent and daughter nuclei on the alpha decay half lives.
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