Abstract
Fourteen first-forbidden β-decays in the region around 203Pb are analysed in terms of only six unknown β-matrix elements between single-particle or single-hole states. Each of the matrix elements is of multipolarity λ = 0 or λ = 1 and is a combination of the usual first-forbidden matrix elements. The analysis gives experimental values for the six β-matrix elements and tests the consistency of the nuclear wave functions. The decay of 206Tl is too fast by a factor of two as compared to the rest of the decays. The experimental values of the β-matrix elements are compared to values calculated with the β-interaction.
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