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A systematic study on the α-decay fine structure of even-odd nuclei in the range 84 Z 102 is done for the first time using our recently proposed Coulomb and proximity potential model for deformed nuclei (CPPMDN). The external drifting potential barrier is obtained by the sum of deformed Coulomb potential, deformed two-term proximity potential and centrifugal potential. The computed half-lives and branching ratios are compared with the experimental values. The standard deviation of logarithmic half-lives and branching ratio is 1.25 and 1.10, respectively. Our study reveals that the CPPMDN formalism is also successful in explaining the α-decay fine structure of even-odd nuclei.

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Systematic study on α-decay fine structure is presented for the first time in the case of odd-even nuclei in the range 83 ≤ Z ≤ 101. The model used for the study is the recently proposed Coulomb and proximity potential model for deformed nuclei (CPPMDN), which employs deformed Coulomb potential, deformed two term proximity potential and centrifugal potential. The computed partial half lives, total half lives and branching ratios are compared with experimental data and are in good agreement. The standard deviation of partial half-life is 1.08 and that for branching ratio is 1.21. Our formalism is also successful in predicting angular momentum hindered and structure hindered transitions. The present study reveals that CPPMDN is a unified theory which is successful in explaining alpha decay from ground and isomeric state; and alpha fine structure of even-even, even-odd and odd-even nuclei. Our study relights that the differences in the parent and daughter surfaces or the changes in the deformation parameters as well as the shell structure of the parent and daughter nuclei, influences the alpha decay probability. *