Abstract
In disagreement with recent suggestions that the beta spectrum of 32P displays a non-allowed shape with a discontinous slope to the shape factor, it has been found that this transition displays the statistical shape with W 0 = 1697±2 keV. Non-statistical shapes can be simulated with inadequate attention to source quality or having a small error in the end-point energy W 0. It is shown that shape factor coefficients are so extremely sensitive to W 0 as to make their utility doubtful. In view of existing uncertainties, a new determination of the shape factor of the highest energy first-forbidden non-unique beta transition in 124Sb confirms the “modified B ij approximation” of Kotani and shows a shape factor C( W) = q 2 + λ 1 p 2 + D with D = 7 ± 2. The end-point energy is W 0 = 2301 ± 4 keV.
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