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Calculation of neutron cross sections on $$^{89}$$Y for JENDL-4

JENDL-4のための$$^{89}$$Y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開発のために、JENDL-3.3の$$^{89}$$Y核データを、分離共鳴領域より上で20MeVまでの中性子入射エネルギー範囲において理論計算により再評価した。核反応の断面積及び中性子放出スペクトルを、4種類の理論模型(球対称光学模型,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。得られた全断面積,弾性及び非弾性散乱,$$(n,gamma)$$, $$(n,2n)$$, $$(n,p)$$及び$$(n,alpha)$$反応に対する断面積は、実験値と定量的に一致した。全断面積及び弾性散乱断面積に対しては、JENDL-3.3よりも実験値をよく再現する結果を得た。さらに、本計算により、JENDL-3.3の評価値と比較して中性子放出スペクトルの測定データの再現性を改善できた。

Nuclear data of $$^{89}$$Y in JENDL-3.3 were reexamined toward JENDL-4 in the neutron energy range above the resolved resonance region to 20 MeV. Cross sections and neutron emission spectra were calculated on the basis of nuclear reaction models such as the spherical optical model, the distorted wave Born approximation, the Kalbach preequilibrium model and the Hauser-Feshbach statistical model. It was found that calculated cross sections were almost consistent with the experimental data for total, elastic and inelastic scattering, $$(n,gamma)$$, $$(n,2n)$$, $$(n,p)$$ and $$(n,alpha)$$ reactions. Agreement with experiments was better than JENDL-3.3 for the total and elastic scattering cross sections. It was also confirmed that measured neutron emission spectra were reproduced well by the present calculation compared with the JENDL-3.3 evaluation.

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