Newly Evaluated Neutron Reaction Data on Chromium Isotopes

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.2021.04.002
G.P.A. Nobre , M.T. Pigni , D.A. Brown , R. Capote , A. Trkov , K.H. Guber , R. Arcilla , J. Gutierrez , A. Cuadra , G. Arbanas , B. Kos , D. Bernard , P. Leconte
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引用次数: 9

Abstract

Neutron reaction data for the set of major chromium isotopes were reevaluated from the thermal energy range up to 20 MeV. In the low energy region, updates to the thermal values together with an improved R-matrix analysis of the resonance parameters characterizing the cluster of large s-wave resonances for 50,53Cr isotopes were performed. In the intermediate and high energy range up to 20 MeV, the evaluation methodology used statistical nuclear reaction models implemented in the EMPIRE code within the Hauser-Feshbach framework to evaluate the reaction cross sections and angular distributions. Exceptionally, experimental data were used to evaluate relevant cross sections above the resonance region up to 5 MeV in the major 52Cr isotope. Evaluations were benchmarked with Monte Carlo simulations of a small suite of critical assemblies highly sensitive to Chromium data, and with the Oktavian shielding benchmark to judge deep penetration performance with a 14-MeV D-T neutron source. A significant improvement in performance is demonstrated compared to existing evaluations.

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新评价的铬同位素中子反应数据
对主要铬同位素组的中子反应数据进行了重新评估,从热能范围到20 MeV。在低能区,对热值进行了更新,并对50,53cr同位素的大s波共振参数进行了改进的r矩阵分析。在20 MeV以下的中高能范围内,评价方法采用Hauser-Feshbach框架下EMPIRE代码中实现的统计核反应模型来评价反应截面和角分布。此外,还利用实验数据对52Cr主同位素高达5 MeV的共振区以上的相关截面进行了评估。通过蒙特卡罗模拟对铬数据高度敏感的一小套关键组件进行基准评估,并使用Oktavian屏蔽基准来判断14-MeV D-T中子源的深穿透性能。与现有评价相比,业绩有了显著改善。
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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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