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[en] High resolution neutron time of flight spectroscopy measurements were made for a sample enriched in ¹⁷⁷Hf using the Columbia University Nevis synchrocyclotron. The measurements used the 202.05 m flight path for transmission measurements and the 39.37 m flight path for capture measurements. We obtain (E₀, gGAMMA/subn/⁰) resonance parameters for 176 levels in ¹⁷⁷Hf to 700 eV and 12 levels in ¹⁷⁸Hf to 720 eV. We also obtained GAMMA/sub gamma/ values for 25 levels in ¹⁷⁷Hf, giving < GAMMA/sub gamma/ > = 65 meV. The s wave strength function for ¹⁷⁷Hf is found to be (2.70 plus-or-minus 0.25). Most s levels were detected to 100 eV, but many were missed above 100 eV. An analysis favors < D₀> = (2.22 plus-or-minus 0.13) eV for the ''true'' s level spacing in ¹⁷⁷Hf. The results to 100 eV are in reasonable agreement with predictions for statistical orthogonal population ensembles

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[en] Electric quadrupole interaction of ¹⁷⁷Hf-probe in lutetium metal and lutetium iron garnet (LuIG) was determined by the PAC method. The quadrupole coupling constant eQVsup(eff)sub(zz)/h is 225+-65 MHz and 688+-53 MHz respectively. EQI in the latter case was found to be temperature independent in the range 78-1200 K. The origin and the magnitude of the electric field gradient in LuIG are discussed

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[en] The structure and decay properties of high-K isomers in ¹⁷⁶Hf have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a K^π=22^-, six-quasiparticle, isomeric (t_1/2=43μs) state at 4864 keV to the 20^- state of a K^π=14^- band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (f_ν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a K^π=16⁺ intrinsic state, is reassigned as the J^π=16⁺ member of the band based on the K^π=15⁺ state at 3080 keV. The systematics of f_ν values as a function of the degree of forbiddenness is discussed in light of this change.