NewKπ=8−Isomer inHf182

A new $\beta$ active $K^{\pi }=8^{-}$ isomer of 9 × ${10}^6$-yr ${}_{}{}^{182}{}_{}{}^{}\mathrm{Hf}$ has been produced via the reaction ${}_{}{}^{186}{}_{}{}^{}\mathrm{W}(p,p\alpha ){}_{}{}^{182m}{}_{}{}^{}\mathrm{Hf}$. $14 \gamma$ rays have been observed to follow a half-life of 65 ± 5 min. Six of the transitions result from the deexcitation of a $K^{\pi }=8^{-}$ isomeric level in ${}_{}{}^{182}{}_{}{}^{}\mathrm{Hf}$ at 1173.5 keV to members of the $K^{\pi }=0^{+}$ ground-state rotational band. The decay of this new $K$ isomer is discussed in relation to the well-known decay of 5.5-h ${}_{}{}^{180m}{}_{}{}^{}\mathrm{Hf}$ to which it is remarkably similar.