Superallowed beta-decay between isobaric analog states up to A=99

Isospin symmetry is used to fit the precisely known QEC Q EC -values of lighter TZ=0,-1 T Z = 0 , - 1 and TZ=-1/2 T Z = - 1 / 2 β β -emitters and to extrapolate them up to $$Z=50$$ Z = 50 . For the T=1 T = 1 emitters the half-lives of the pure 0⁺→ 0⁺ 0 + → 0 + Fermi decays are calculated and compared with experimentally known values, even for the heaviest cases where the experimental uncertainties are still rather large. For the T = 1/2 T = 1 / 2 emitters only the Fermi component of the transitions can be predicted, but with the experimental half-lives the ratio of Gamow–Teller to Fermi strength can be determined.