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数MeV以上のENDF/B-VIII.0及びJEFF-3.3の銅核データの問題

Problems on ENDF/B-VIII.0 and JEFF-3.3 copper nuclear data above a few MeV

権 セロム*; 今野 力  ; 太田 雅之*; 佐藤 聡*

Kwon, Saerom*; Konno, Chikara; Ota, Masayuki*; Sato, Satoshi*

JAEA/FNSで行った銅ベンチマーク実験を核データライブラリENDF/B-VIII.0及びJEFF-3.3を用いて解析したところ、10MeV以上の中性子に感度を有する$$^{93}$$Nb(n,2n)$$^{92m}$$Nb反応の反応率をENDF/B-VIII.0を用いた計算値は実験値を大幅に過小評価、JEFF-3.3を用いた計算値は実験値を大幅に過大評価した。今回、この原因を調べ、数MeV以上の(n,np)や(n,n')反応等のデータに起因することがわかった。

Our analyses of JAEA/FNS copper benchmark experiment with ENDF/B-VIII.0 and JEFF-3.3 pointed out that the calculation with ENDF/B-VIII.0 underestimated and that with JEFF-3.3 overestimated the measured reaction rate of the $$^{93}$$Nb(n,2n)$$^{rm 92m}$$Nb sensitive to neutrons above 10 MeV. As a result of our detailed study, we specified that this issue was due to the (n,np) and (n,n') reaction data above a few MeV, etc.

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