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arXiv 2408.10098nucl-ex
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keV能区铀-233中子俘获截面的评估

Evaluation of uranium-233 neutron capture cross section in keV region

Naohiko Otuka, Kenichi Tada, Oscar Cabellos, Osamu Iwamoto

AI总结:

该研究利用新测量的α值评估keV能区铀-233中子俘获截面,发现其较主流数据库系统偏低(20 keV处较JENDL-5降近50%),且经166个临界实验基准验证后累积卡方值略有降低。

摘要:

利用洛斯阿拉莫斯国家实验室LANCE装置最新测量并汇编入EXFOR数据库的α值,评估了3 keV至1 MeV范围内的铀-233中子俘获截面。所得俘获截面系统低于主要通用核数据库最新版本中的数据,在20 keV附近较JENDL-5数据库降低近50%。通过采用JENDL-5数据库进行蒙特卡洛中子输运计算,将新评估的截面与ICSBEP手册中选取的166个临界实验进行基准验证,结果显示采用新截面后累积卡方值略有降低。

英文摘要:

The uranium-233 neutron capture cross section between 3 keV and 1 MeV was evaluated with the new alpha value recently measured at the Los Alamos National Laboratory LANCE facility and compiled in the EXFOR library. The obtained capture cross section is systematically lower than those in the latest versions of the major general purpose nuclear data libraries, and the reduction from the JENDL-5 library is close to 50% around 20 keV. The newly evaluated cross section was benchmarked against 166 criticality experiments chosen from the ICSBEP handbook by performing Monte Carlo neutron transport calculation with the JENDL-5 library, and slight reduction of the cumulative chi-square value was achieved by adoption of the newly evaluated capture cross section.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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