Decay of the five-quasiparticle isomeric states in 177Hf

The decay of 51.4-min ${}^{177m_2}Hf$ 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 β-ray spectrometer. An E3 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=31/2 member. The rotational-model quantity $\frac{{(g_K-g_R)}^2}{Q_0^{{}^2}}$, derived from the γ-ray intensities of the cascade and crossover transitions, was used to deduce the gyromagnetic ratios for this band.