液体に対する熱中性子散乱断面積理論計算法の調査

Material type: 文書・図像類

Author: 市原晃

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Publication date: 2020-03

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Note (General)：: Toward the revision of JENDL-4.0, we conducted a literature survey on how to compute the cross section of thermal neutrons scattered by a liquid. This...

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Summary, etc.：: Toward the revision of JENDL-4.0, we conducted a literature survey on how to compute the cross section of thermal neutrons scattered by a liquid. This...

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Material Type: 文書・図像類
Title: 液体に対する熱中性子散乱断面積理論計算法の調査
Author/Editor: 市原晃
Author Heading: 市原晃
Publication Date: 2020-03
Publication Date (W3CDTF): 2020-03
Alternative Title: Survey of computational methods of cross sections for thermal neutron scattering by liquids
Periodical title: JAEA-Review 2019-046
Text Language Code: eng
Target Audience: 一般
Note (General): Toward the revision of JENDL-4.0, we conducted a literature survey on how to compute the cross section of thermal neutrons scattered by a liquid. This report summarizes the computational methods for evaluating thermal neutron cross sections with molecular dynamics simulations. The cross section can be expressed with a function called as scattering law. For light and heavy water, the scattering law data instead of the cross sections have been provided in nuclear databases. In this report we review the formulations of the scattering laws. The scattering laws can be derived from both the intermediate scattering function and the space-time correlation function. Features of the derived scattering laws are briefly explained. It is shown that the scattering law data can be evaluated using a molecular dynamics simulation of the liquid that is the target of thermal neutrons.
JENDL-4.0の改定に向けて、液体に対する熱中性子散乱断面積の計算法に関する文献調査を実施した。本報告書は、分子動力学シミュレーションを利用した熱中性子散乱断面積の計算法を要約したものである。断面積は「散乱則」と呼ばれる関数を使って表され、軽水や重水に対しては断面積の代わりに散乱則に関するデータが核データベース上で与えられている。本調査で散乱則の計算法を確認した。散乱則は中間散乱関数と時空間相関関数の両者から導くことができる。得られる散乱則の特徴について言及した。熱中性子のターゲットである液体の分子動力学シミュレーションを利用して散乱則が計算できることを示した。
Source: /JAEA-Review-2019-046.pdf （fulltext）
https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2019-046.pdf
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System