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Measurement and analysis of the neutron-induced total cross-sections of 209Bi from 0.3 eV to 20 MeV on the Back-n at CSNS

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【作者】 薛洁明冯松陈永浩易晗李鑫祥肖敏程品晶刘荣羊奕伟韩子杰赵大俊王豪强李宝钱赵继荣刘梓隽陈朝敏罗文郑波

【Author】 Jieming Xue;Song Feng;Yonghao Chen;Han Yi;Xinxiang Li;Min Xiao;Pinjing Cheng;Rong Liu;Yiwei Yang;Zijie Han;Dajun Zhao;Haoqiang Wang;Baoqian Li;Jirong Zhao;Zijun Liu;Chaomin Chen;Wen Luo;Bo Zheng;School of Nuclear Science and Technology, University of South China;Institute of High Energy Physics, Chinese Academy of Sciences (CAS);Spallation Neutron Source Science Center;Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

【机构】 School of Nuclear Science and Technology, University of South ChinaInstitute of High Energy Physics, Chinese Academy of Sciences (CAS)Spallation Neutron Source Science CenterInstitute of Nuclear Physics and Chemistry China Academy of Engineering Physics

【摘要】 The neutron-induced total cross-section of 209Bi is crucial for the physical design and safety assessment of lead-based fast reactors, and the quality of experimental data should be improved for evaluation and application.A recent experiment was conducted on the back-streaming white neutron beamline(Back-n) at the China Spallation Neutron Source(CSNS) using the neutron total cross-section spectrometer(NTOX). The neutron energy was determined using a fast multi-cell fission chamber and the time-of-flight technique. Two high-purity bismuth samples,6 mm and 20 mm in thickness, were chosen for neutron transmission measurements and comparisons. The neutron total cross-sections of 209Bi, ranging from 0.3 e V to 20 Me V, were derived considering neutron flight time determination, flight path calibration, and background subtraction. A comparison of the experimental results with the data in the ENDF/B-VⅢ.0 library showed fair agreement, and the point-wise cross-sections were found to be consistent with existing experimental data. Special attention was given to the determination of resonance parameters, which were analyzed using the R-matrix code SAMMY and Bayesian method in the 0.5 ke V to 20 ke V energy range. The extracted resonance parameters were compared to previously reported results and evaluated data. This study is recognized as the first one where the neutron total cross-section of bismuth across such a broad energy spectrum is measured in a single measurement or experiment, and it provides valuable data for the assessment of related reaction information for evaluated libraries and the advancement of lead-bismuth-based nuclear systems.

【Abstract】 The neutron-induced total cross-section of 209Bi is crucial for the physical design and safety assessment of lead-based fast reactors, and the quality of experimental data should be improved for evaluation and application.A recent experiment was conducted on the back-streaming white neutron beamline(Back-n) at the China Spallation Neutron Source(CSNS) using the neutron total cross-section spectrometer(NTOX). The neutron energy was determined using a fast multi-cell fission chamber and the time-of-flight technique. Two high-purity bismuth samples,6 mm and 20 mm in thickness, were chosen for neutron transmission measurements and comparisons. The neutron total cross-sections of 209Bi, ranging from 0.3 e V to 20 Me V, were derived considering neutron flight time determination, flight path calibration, and background subtraction. A comparison of the experimental results with the data in the ENDF/B-VⅢ.0 library showed fair agreement, and the point-wise cross-sections were found to be consistent with existing experimental data. Special attention was given to the determination of resonance parameters, which were analyzed using the R-matrix code SAMMY and Bayesian method in the 0.5 ke V to 20 ke V energy range. The extracted resonance parameters were compared to previously reported results and evaluated data. This study is recognized as the first one where the neutron total cross-section of bismuth across such a broad energy spectrum is measured in a single measurement or experiment, and it provides valuable data for the assessment of related reaction information for evaluated libraries and the advancement of lead-bismuth-based nuclear systems.

【基金】 Supported by the National Natural Science Foundation of China (12375296);the Key Laboratory of Nuclear Data Foundation (JCKY2022201C153);the National Key Research and Development Plan (2022YFA1603303);the Natural Science Foundation of Hunan Province of China (2021JJ40444, 2020RC3054)
  • 【文献出处】 Chinese Physics C ,中国物理C , 编辑部邮箱 ,2023年12期
  • 【分类号】O571.5
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