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Evaluation of neutron nuclear data on tellurium isotopes

テルル同位体中性子核データの評価

柴田 恵一

Shibata, Keiichi

次期汎用評価済み核データライブラリのために$$^{120,121m,122,123,124,125,126,127m,128,129m,130,131m,132}$$Teの中性子核データを$$10^{-5}$$eVから20MeVのエネルギー範囲で評価した。分離共鳴パラメータが存在しない核種の熱中性子捕獲断面積は実験値あるいは簡易式より決定した。自己遮蔽計算のために、全標的核に対して非分離共鳴パラメータを求めた。一方、分離共鳴領域以上のエネルギーでは、統計模型コードCCONEにより断面積を計算した。中性子と原子核間の相互作用はチャネル結合光学模型ポテンシャルを用いた。CCONEの計算では、複合核過程に加えて、前平衡及び直接過程を考慮した。評価結果は既存の実験値とよく一致しており、JENDL-4.0を上回る再現性であった。今回得られた結果から、ENDF型式でデータファイルを作成した。

Neutron nuclear data on $$^{120,121m,122,123,124,125,126,127m,128,129m,130,131m,132}$$Te have been evaluated for the next release of JENDL general purpose file in the energy region from 10$$^{-5}$$ eV to 20 MeV. Concerning the target nuclei for which resolved resonance parameters are unavailable, the thermal capture cross sections were determined from measurements or from a simplified formula. Unresolved resonance parameters were obtained for self-shielding calculations. On the other hand, a statistical model code CCONE was applied to calculate cross sections above the resolved resonance region. Coupled-channel optical-model potentials were employed for the interaction between neutrons and nuclei. Preequilibrium and direct-reaction processes were taken into account in addition to the compound process. The presently evaluated results are consistent with available experimental data, and found to be much better than the JENDL-4.0 evaluation. The evaluated data are compiled into ENDF formatted data files.

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