Decay of the Five-Quasiparticle Isomeric States inHf177

The decay of 51.4-min ${}_{}{}^{177m_2}{}_{}{}^{}\mathrm{Hf}$ has been studied in detail by means of Ge(Li) detectors and a Si(Li) detector. The $L$-subshell conversion-electron ratios for the 214.0-keV isomeric transition were measured with a double-focusing $\beta$-ray spectrometer. An $E3\mathrm{}$ multipolarity was deduced for the isomeric transition, and thus a spin-parity of $I^{\pi }={\frac{37}{2}}^{-}$ was established for the isomeric state. Coincidence measurements identify the $K^{\pi }={\frac{23}{2}}^{+}$ rotational band up to the $I=\frac{31}{2}$ member. The rotational-model quantity $\frac{{(g_K-g_R)}^2}{Q_0^{}{}_{}{}^2}$, derived from the $\gamma$-ray intensities of the cascade and crossover transitions, was used to deduce the gyromagnetic ratios for this band.