Abstract
Resonance parameters for neutron energies from 3 eV to 200 eV and average capture cross sections for energies up to 20 keV have been measured for the separated isotopes 155Gd and 157Gd with neutron time-of-flight techniques and a large liquid scintillator. In addition, the average capture cross section of natural gadolinium was measured from 1 keV to 750 keV. The s-wave strength functions obtained are 2.17 +0.30 −0.14×10 −4 for 155Gd. and 2.9 +0.9 −0.5×10 −4 for 157Gd, and these values are significantly higher than those predicted from the collective-model generalisation of the optical model. The total radiation widths for resolved resonances are found to have a much larger variance than that predicted by the statistical model, provided the widths are assumed to be spin-independent. The average capture cross section at higher energies is also found to deviate from conventional statistical-model predictions.
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