2000年8月
Measurement of Np-237 fission rate ratio relative to U-235 fission rate in cores with various thermal neutron spectrum at the Kyoto University Critical Assembly
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
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- 巻
- 37
- 号
- 8
- 開始ページ
- 627
- 終了ページ
- 635
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.3327/jnst.37.627
- 出版者・発行元
- ATOMIC ENERGY SOC JAPAN
integral measurements of Np-237 fission rate ratio relative to U-235 fission rate have been performed at Kyoto University Critical Assembly. The fission rates have been measured using the back-to-back type double fission chamber at five thermal cores with different H/U-235 ratio so that the neutron spectra of the cores were systematically varied. The measured fission rate ratio per atom was 0.00439 to 0.0298, with a typical uncertainty of 2 to 3%. The measured data were compared with the calculated results using SRAC/TWOTRAN and MVP based on JENDL-3.2, which gave the averaged C/E values of 0.93 and 0.95, respectively. Obtained results of CIE using Np-237 cross sections from JENDL-3/2, ENDF/B-VI.5 and JEF2.2 show that the latter two gave smaller results than JENDL-3.2 by about 4%, which clearly reflects the discrepancy in the evaluated cross section among the libraries. This difference arises from both fast fission and resonance region. Although further improvement is recommended, Np-237 fission cross section in JENDL-3.2 is considered to be superior to those in the other libraries and can be adopted for use in design calculations for minor actinide transmutation system using thermal reactors with prediction precision of Np-237 fission rate within 10%.
- リンク情報
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- DOI
- https://doi.org/10.3327/jnst.37.627
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902149837601695
- CiNii Articles
- http://ci.nii.ac.jp/naid/10004558090
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000089650100001&DestApp=WOS_CPL
- ID情報
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- DOI : 10.3327/jnst.37.627
- ISSN : 0022-3131
- J-Global ID : 200902149837601695
- CiNii Articles ID : 10004558090
- Web of Science ID : WOS:000089650100001