Comparison of Results from Recent NNSA and CEA Measurements of the 239Pu(n, f) Prompt Fission Neutron Spectrum

IF 2.8 1区 物理与天体物理 Q2 PHYSICS, NUCLEAR Nuclear Data Sheets Pub Date : 2021-03-01 DOI:10.1016/j.nds.2021.04.003
K.J. Kelly , P. Marini , J. Taieb , M. Devlin , D. Neudecker , R.C. Haight , G. Bélier , B. Laurent , P. Morfouace , J.M. O'Donnell , E. Bauge , M.B. Chadwick , A. Chatillon , D. Etasse , P. Talou , M.C. White , C.Y. Wu , E.A. Bennett
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引用次数: 7

Abstract

The National Nuclear Security Administration (NNSA)/DP French Alternative Energies and Atomic Energy Commission (CEA)/DAM agreement on cooperation on fundamental science is a U.S.-French collaborative effort to combine intellectual and experimental resources and further the relevant nuclear science. Recently, both the NNSA and CEA experimental teams performed high-statistics measurements of the 239Pu(n, f) prompt fission neutron spectrum (PFNS) at the Los Alamos Neutron Science Center, both of which were recently published in the journal Physical Review C. These separate measurements used the same experimental area and a common neutron detector array, but differ in many aspects, including background assessments, data acquisition systems and philosophies, fission detectors, and PFNS extraction techniques. Hence, some aspects of the experimental methods and associated uncertainties are highly correlated while others are independent. The results from both measurements broke new ground for PFNS measurements given their higher accuracy and more detailed study of corrections necessary for the measured quantity compared to existing literature measurements, and both will significantly impact PFNS nuclear data evaluations for the foreseeable future. The focus of this work is to document a comparison of the results from these distinct measurements in terms of the acquired data, the PFNS results, and the measured average PFNS energies. While systematic differences between the PFNS results are present on the 1–3% level, the acquired data relative to each respective measurement at low incident neutron energies are in remarkable agreement, as are the conclusions regarding the magnitude and position of features in the PFNS relating to second-chance fission, third-chance fission, and pre-equilibrium neutron emission.

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239Pu(n,f)快裂变中子谱NNSA和CEA近期测量结果的比较
美国国家核安全管理局(NNSA)/法国替代能源和原子能委员会(CEA)/法国原子能研究所(DAM)关于基础科学合作的协议是一项美法合作努力,旨在将智力和实验资源结合起来,进一步发展相关的核科学。最近,NNSA和CEA的实验团队在洛斯阿拉莫斯中子科学中心对239Pu(n, f)提示裂变中子谱(PFNS)进行了高统计量的测量,这两项测量最近都发表在《物理评论c》杂志上。这些单独的测量使用了相同的实验区域和共同的中子探测器阵列,但在许多方面有所不同,包括背景评估、数据采集系统和原理、裂变探测器、PFNS提取技术。因此,实验方法的某些方面和相关的不确定性是高度相关的,而其他方面是独立的。与现有文献测量相比,这两项测量结果具有更高的精度和更详细的测量量校正研究,为PFNS测量开辟了新的领域,并且在可预见的未来,这两项测量结果都将对PFNS核数据评估产生重大影响。这项工作的重点是记录这些不同测量结果在获取数据、PFNS结果和测量的平均PFNS能量方面的比较。虽然PFNS结果之间的系统差异存在于1-3%的水平上,但在低入射中子能量下获得的相对于各自测量的数据是非常一致的,关于PFNS中与第二次裂变、第三次裂变和预平衡中子发射有关的特征的大小和位置的结论也是如此。
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来源期刊
Nuclear Data Sheets
Nuclear Data Sheets 物理-物理:核物理
CiteScore
7.80
自引率
5.40%
发文量
22
审稿时长
>12 weeks
期刊介绍: The Nuclear Data Sheets are current and are published monthly. They are devoted to compilation and evaluations of experimental and theoretical results in Nuclear Physics. The journal is mostly produced from Evaluated Nuclear Structure Data File (ENSDF), a computer file maintained by the US National Nuclear Data Center
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