Superallowed beta-decay between isobaric analog states up to $${{\textbf {A}}}=\textbf{99}$$

Abstract

AbstractIsospin symmetry is used to fit the precisely known $$Q_{EC}$$ Q EC -values of lighter $$T_Z=0,-1$$ T Z = 0 , - 1 and $$T_Z=-1/2$$ T Z = - 1 / 2 $$\beta $$ β -emitters and to extrapolate them up to $$Z=50$$ Z = 50 . For the $$\hbox {T}=1$$ T = 1 emitters the half-lives of the pure $$0^+\rightarrow 0^+$$ 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 $$\hbox {T} = 1/2$$ 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.