Abstract
The neutron capture cross sections of 178, 179, 180Hf were measured in the energy range 2.6 keV to 2 MeV. The average capture cross sections were derived and fitted in terms of strength functions. Resonance parameters for the observed resonances below 10 keV were determined by shape analysis. Maxwellian averaged capture cross sections were computed for thermal energies with kT between 5 and 100 keV. The cross sections for kT = 30 keV were used to determine the population probability of the 8− isomeric level in 180Hf by neutron capture as (1.24 ± 0.06)% and the r-process abundance of 180Hf as 0.0290 (Si = 106). These quantities served to analyze s- and r-process nucleosynthesis of 180Ta, nature’s rarest stable isotope.
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