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Updated nuclear data of lanthanoids in fission products for JENDL-4.0

JENDL-4.0での核分裂生成物であるランタノイド核種の最新核データ

岩本 信之  

Iwamoto, Nobuyuki

JENDL-4.0を開発するために核データ評価計算を行った。核分裂生成物であるランタノイド核種の核データ評価を20MeVまでの連続領域において二つのパートに分けて実施した。まずはじめに、チャンネル結合光学モデル計算を行い、ターゲットに対する全断面積,弾性散乱角度分布を評価することにより中性子透過係数を得た。次に、その透過係数を用いて核反応モデルにより核反応断面積を計算し、非弾性散乱断面積やその他の反応断面積が測定値と矛盾しないように評価した。その結果、反応断面積,角度分布,放出粒子や光子の二重微分断面積が測定値をよく再現する核データを得た。

The nuclear data evaluation was performed to develop the Japanese Evaluated Nuclear Data Library, JENDL-4.0, which was released on early 2010. The evaluation of fission products (e.g., Nd-Dy of lanthanoid elements) in the smooth region up to 20MeV was carried out by dividing the procedure into two parts. First, the coupled-channels optical model calculations were done to obtain the neutron transmission coefficients for target nuclides. Second, the reaction cross sections were calculated by using nuclear reaction model. The reaction cross sections for total, elastic, and inelastic scattering cross sections, and the other reaction cross sections whose channels are open were evaluated to reproduce measured cross sections. It is found that the presently obtained reaction cross sections, angular distributions and double differential cross sections of emitted particles and photons were well consistent with experimental data.

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パーセンタイル:20.2

分野:Physics, Multidisciplinary

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