Abstract
The second-forbidden beta decay matrix element Aij is given in terms of the nuclear spin orbit potential strength u and another second-forbidden beta decay matrix element Rij. The result is used, together with the predictions of the Mayer shell model for the single particle configurations, to obtain an estimate of u from the decay of 99Tc for two types of space dependence of the spin orbit potential. The result is in reasonable agreement with that found from a study of the stationary states of 5He.
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