Evaluation of beta-decay, Part VII: The Z-independent outer radiative correction for unique-forbidden decay

Radiative correction to forbidden beta-transitions differs from that for allowed decay owing to the different forms of the beta-spectra. Graphical material is presented for the radiative correction of order α for electrons and for positrons in the ranges 0⩽E0⩽20 MeV and 0⩽|Z|⩽100 for unique first-, second- and third-forbidden transitions.