Measurement of thermal neutron cross-sections and resonance integrals for 164Dy(n,γ)165Dy and 180Hf(n,γ)181Hf reactions

The thermal neutron cross-sections for the 164Dy(n,γ)165Dy and the 180Hf(n,γ)181Hf reactions have been measured by the activation method at the heavy water thermal neutron facility of the Kyoto University Reactor, KUR. The results measured at 0.0253 eV are 2656±98 b for the 164Dy(n,γ)165Dy reaction and 13.04±0.47 b for the 180Hf(n,γ)181Hf reaction, respectively. The results have been obtained relative to the reference value of 98.65±0.09 b for the 197Au(n,γ) 198Au reaction. For dysprosium, most of the experimental data and the evaluated ones in ENDF/B-VI and JEF-2.2 are in good agreement with the present value. For hafnium, the previous measurements and the evaluated ones in ENDF/B-VI and JENDL-3.2 are in good agreement with the present result. sonance integrals for the 164Dy(n,γ)165Dy and the 180Hf(n,γ)181Hf reactions have also been measured relative to the reference value of 1550±28 b for the 197Au(n,γ)198Au reaction using a 1/E standard neutron spectrum field of the Kinki University Reactor, UTR-KINKI. The present resonance integral for the 164Dy(n,γ)165Dy reaction is 649±24 b, and the existing experimental and the evaluated data are distributed from 335 to 820 b. The present result for the 180Hf(n,γ)181Hf reaction is 32.4±1.2 b, and most of the previous measurements and the evaluated values are close to the present measurement. Gryntakis et al. reported the resonance integrals for both reactions, whose results were also in good agreement with the measurements.