We have reinvestigated the ${\beta }^{+}$ decay of ${}_{}{}^{24}{}_{}{}^{}\mathrm{Al}$($4^{+}$) and find that the analog transition has $\mathcal{F}t=3106\mathrm{}\pm 38$ sec. This is consistent with the value $\mathcal{F}t=3081.7\mathrm{}\pm 1.9$ sec obtained from the $0^{+}$ → $0^{+}$ pure Fermi transitions but inconsistent with the value $\mathcal{F}t=5715\mathrm{}\pm 13$ sec claimed for the Fermi component of ${}_{}{}^{35}{}_{}{}^{}\mathrm{Ar}$ decay. We find no evidence for the speculation that Fermi matrix elements of high-$J$ states are anomalously large and conclude that the ${}_{}{}^{35}{}_{}{}^{}\mathrm{Ar}$ result is probably due to experimental error.

• Received 22 July 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.2129