ON THE COUPLING CONSTANTS IN BETA-DECAY
Recent experimental data on superallowed transitions are used in a redetermination of the decay coupling constants. It is suggested that the β-decay interaction may contain an admixture of vector coupling besides the usually adopted scalar and tensor interactions.
The improved accuracy in the experimental data on superallowed β-transitions as well as the determination of several new ft-values for superallowed 0 —> 0 transitions permit a higher accuracy in the determination of the coupling constants in β-decay. We shall follow the same procedure as applied earlier. In the first section, we assume that no cross terms are present, which, according to recent recoil investigations, means that the β-interaction is a mixture of scalar and tensor coupling only. In the second part, we consider the evidence on the possible admixture of axial vector and, especially, vector interaction.