Evaluation of neutron nuclear data on krypton isotopes

クリプトン同位体に対する中性子核データの評価

Rashid, M. M.*; 執行 信寛*; 石橋 健二*; 岩本 信之  ; 岩本 修  

Rashid, M. M.*; Shigyo, Nobuhiro*; Ishibashi, Kenji*; Iwamoto, Nobuyuki; Iwamoto, Osamu

クリプトン同位体の中性子核データ評価を入射エネルギー1keVから20MeVの範囲に対して行った。評価は核反応計算コードCCONEを用い、天然クリプトンの全断面積に対する測定データを再現するようにチャンネル結合光学モデルのポテンシャルパラメータを決めた。核反応には複合核、前平衡、直接過程を考慮して、反応断面積計算を実施した。計算結果は測定データ及び評価済データと比較されており、今回の評価データは測定データをよく再現していた。

Neutron nuclear data of krypton isotopes have been evaluated in the incident neutron energy range from 1 keV to 20 MeV by using theoretical nuclear reaction model code CCONE. The phenomenological optical model potential was employed to calculate total reaction cross section for natural krypton. This calculation is based on the coupled channel method. However, optical potential parameters were obtained by best fitting the calculation result with experimental total cross section of natural krypton. The transmission coefficients were calculated which was used for getting the cross sections in outgoing reaction channels. Compound, pre-equilibrium, and direct reaction processes were taken into consideration for cross section calculation. The present calculation results were compared with the experimental data and major evaluated nuclear data libraries. It is observed that the present evaluation can explain the experimental data reasonably well.