In view of new data on the ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$ superallowed Fermi β decay, the radiative corrections have been reevaluated. In particular we calculate and include the nuclear-structure-dependent part of the axial-vector-induced contribution to the O(α) radiative correction. The resulting ${\mathit{V}}_{\mathit{u}\mathit{d}}$ is appreciably larger than a value recently published, which was based on the same data.

• Received 25 March 1991

DOI:https://doi.org/10.1103/PhysRevC.44.R5