Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of the ^<166m>Ho(n,γ)^<167>Ho Reaction using a Two-Step Irradiation Technique

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The thermal neutron capture cross section (σ0) and the resonance integral (I0) of 166mHo have been measured as data for the transmutation of nuclear waste. Samples of 166mHo were made by the neutron irradiation of 165Ho. Two metallic foils of 165Ho were irradiated for 2 weeks and two others for 3 weeks at the Kyoto University Reactor. A high purity Ge detector was employed for activity measurement. The samples irradiated were cooled for 3 months to reduce the activity of 166gHo. One of the samples irradiated for 2 weeks was irradiated again with Cd cover sheets and the other one without a Cd cover sheet. For the samples irradiated for 3 weeks, the same irradiation was performed. The 167Ho nuclei were produced at the second irradiation via the neutron capture of 166mHo and the double neutron capture of 165Ho. The amount of 167Ho via the double capture was estimated from the difference between the data of 2 week irradiation and 3 week irradiation, and corrected. The reaction rate to produce 167Ho from 166mHo was analyzed by Westcott’s convention. A resonance at 0.274 eV was considered in the analysis. The results obtained were 3.11±0.82 kb for the σ0 and 10.0±2.7 kb for the I0 of 166mHo.
社団法人日本原子力学会の論文
2002-07-25