Neutron resonance spectroscopy: 177Hf

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 = (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