検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Covariance analyses of self-shielding factor and its temperature gradient for uranium-238 neutron capture reaction

ウラン238中性子捕獲反応に対する自己遮蔽因子とその温度勾配の共分散解析

大塚 直彦; 瑞慶覧 篤*; 高野 秀機*; 千葉 豪; 石川 眞

Otsuka, Naohiko; Zukeran, Atsushi*; Takano, Hideki*; Chiba, Go; Ishikawa, Makoto

ウラン238の中性子捕獲反応に対する自己遮蔽因子とその温度勾配の共分散を共鳴パラメータの共分散と自己遮蔽因子及びその温度勾配の共鳴パラメータに対する感度から評価した。ウラン238の共分散はJENDL-3.3から取得し、感度係数は共鳴パラメータと温度に摂動を与えることによって求めた。新しい計算機コード群が共鳴パラメータと温度に関する摂動を求めるために開発された。本解析の結果、共鳴パラメータ同士の相関は自己遮蔽因子とその温度勾配の標準偏差に大きく寄与することが判明した。これらの標準偏差に加え、自己遮蔽因子とその温度勾配の持つ共分散をJFS-3 70群構造に関して求めた。

Covariances of the self-shielding factor and its temperature gradient for the uranium-238 neutron capture reaction have been evaluated from the resonance parameter covariance matrix and sensitivity of the self-shielding factor and its temperature gradient to microscopic nuclear data. The resonance parameters and their covariance matrix for uranium-238 were taken from JENDL-3.3, while the sensitivity coefficients were calculated by varying resonance parameters and temperature. A set of computer code modules has been developed for calculation of the sensitivity coefficients at numerous resonance levels. The present result shows that the correlation among resonance parameters yields a substantial contribution to the variances of the self-shielding factor and its temperature gradient. In addition to the variances of these quantities, their correlation matrices in the JFS-3 70 group structure are also obtained.

Access

:

- Accesses

InCites™

:

パーセンタイル:77.67

分野:Nuclear Science & Technology

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.