Journal
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
Volume 56, Issue 6, Pages 493-502Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00223131.2019.1598304
Keywords
Neptunium-237; Protactinium-233; thermal-neutron capture cross-section; resonance integral; activation method; gamma-ray spectroscopy; emission probability
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Funding
- Ministry of Education, Science, Sports and Culture [23561019]
- Grants-in-Aid for Scientific Research [23561019] Funding Source: KAKEN
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The thermal-neutron capture cross-section (sigma(0)) and resonance integral (I-0) were measured for the Np-237(n,) Np-238 reaction by an activation method. A method with a Gadolinium filter, which is similar to the Cadmium difference method, was used to measure the sigma(0) with paying attention to the first resonance at 0.489eV of Np-237, and a value of 0.133eV was taken as a cut-off energy. Neptunium-237 samples were irradiated at the pneumatic tube of the Kyoto University Research Reactor in Institute for Integral Radiation and Nuclear Science, Kyoto University. Wires of Co/Al and Au/Al alloys were used as monitors to determine thermal-neutron fluxes and epi-thermal Westcott's indices at an irradiation position. A -ray spectroscopy was used to measure activities of Np-237, Np-238 and neutron monitors. On the basis of Westcott's convention, the sigma(0) and I-0 values were derived as 186.9 +/- 6.2 barn, and 1009 +/- 90 barn, respectively.
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