![]() ![]() The root-mean-square deviations from experimental partial half-lives for even–even, odd- A, and odd–odd nuclei are 0.344, 0.740, and 0.940 (in log 10), respectively. The values obtained for the three adjustable parameters are reasonable, in contrast with those of conventional models such as the Viola–Seaborg formula. Parameters in the formula are fixed because they are determined by physical constants except for the following three adjustable parameters: the product of the collision frequency of an α particle and the formation probability, N the distance between the charge radius and the radius of an inner point of the Coulomb barrier, r 0 and the odd-mass hindrance, h 0. It is constructed in a conventional way by considering the penetrability of a charged particle in a spherical Coulomb potential. A phenomenological formula is presented for the partial half-life from the Q value for α decay.
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