A survey was made of logft values for forbidden β transitions. Three cases, ⁹⁰ᵐY, ⁶⁵Ni, and ¹⁴⁴Pm decays, were examined experimentally. A number of low logft values reported in the literature are superseded by more recent larger values. Empirical rules for making spin and parity assignments from logft values are proposed.
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Raman et al. (1973) studied this question.
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