Giant Gamow-Teller Excitation ofDy148Populated inβ+Decay

A precise study of ${}_{}{}^{148}{}_{}{}^{}\mathrm{Dy}$ Gamow-Teller ${\beta }^{+}$ decay gives 97% direct feeding to the $\left(\pi h_{\frac{11}{2}}\nu h_{\frac{9}{2}}\right)1^{+}$ state in the daughter nucleus ${}_{}{}^{148}{}_{}{}^{}\mathrm{Tb}$, corresponding to $logft=3.95\mathrm{}\left(3\right)\mathrm{}$. The transition strength is only 15% of the value calculated with the quasiparticle random-phase approximation, which takes into account pairing effects and ground-state correlation. The strength reduction is significantly larger than found in other $\pi j_{>}\to \nu j_{<}$ Gamow-Teller ${\beta }^{+}$ decays.