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Calculation of neutron cross sections on $$^{90,91,92,94,96}$$Zr for JENDL-4

JENDL-4のための$$^{90,91,92,94,96}$$Zr中性子断面積の理論計算

市原 晃; 国枝 賢; 柴田 恵一

Ichihara, Akira; Kunieda, Satoshi; Shibata, Keiichi

JENDL-4開発に向けて、分離共鳴領域より上で20MeV以下の中性子入射エネルギーにおいて、$$^{90,91,92,94,96}$$Zrの中性子核データを4種類の核反応模型(球光学模型,歪曲波Born近似,Kalbach前平衡模型,Hauser-Feshbach統計模型)を適用して計算した。得られた弾性,弾性外及び非弾性散乱、$$(n,gamma)$$, $$(n,2n)$$, $$(n,p)$$, $$(n,alpha)$$反応に対する断面積は、実験データとよく一致した。$$^{90,92,94}$$Zrの$$(n,gamma)$$断面積については、JENDL-3.3の評価値と比較して実験値の再現性を改善できた。

Neutron nuclear data of $$^{90,91,92,94,96}$$Zr were calculated for the development of the 4-th version of the Japanese Evaluated Nuclear Data Library (JENDL-4) in the incident neutron energy range above the resolved resonance region to 20 MeV by using nuclear reaction models such as the spherical optical model, the distorted wave Born approximation, the Kalbach preequilibrium model, and the Hauser-Feshbach statistical model. Obtained cross sections were almost consistent with the experimental data for elastic, nonelastic and inelastic scattering, $$(n,gamma), (n,2n), (n,p)$$ and $$(n,alpha)$$ reactions. The agreement with recent experiments is better than the evaluated data in JENDL-3.3 for the $$(n,gamma)$$ cross sections on $$^{90,92,94}$$Zr.

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