Stopping Force Analysis of 235U Elemental Fission Product Yields for En = 0.11–92.4 MeV

IF 2.8 1区 物理与天体物理 Q2 PHYSICS, NUCLEAR Nuclear Data Sheets Pub Date : 2022-09-01 DOI:10.1016/j.nds.2022.08.001
M.E. Moore , J. Latta , L. Snyder , B.G. Fulsom , U. Greife , S.M. Lyons , L.S. Wood , D.L. Duke , The FissionTPC IFPY Collaboration, M. Anastasiou , J.S. Barrett , N.S. Bowden , J. Bundgaard , R.J. Casperson , T. Classen , D.H. Dongwi , J. Gearhart , V. Geppert-Kleinrath , U. Greife , M. Haseman , L. Yao
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引用次数: 3

Abstract

Most evaluated elemental fission product yield distributions are not experimentally measured. Instead, the majority of evaluated distributions are based on analytic expressions of the Zp-model for relevant cumulative yields. Here we report independent elemental fission product yield distributions of a 235U target for incident neutron energies ranging from 0.11 MeV through 92.4 MeV. Atomic numbers are calculated by an approach that combines a 2E analysis with a stopping force analysis method, developed within this paper. These analyses are applied to more than 6.1 × 106 fission fragment ionization tracks captured within the NIFFTE (Neutron Induced Fission Fragment Tracking Experiment) collaboration fission time projection chamber (fissionTPC). A 3-Z resolution was obtained with the fissionTPC spatial and energy resolutions. Tabulated results are presented for the atomic yield and experimentally derived Zp values as a function of pre-neutron-emission fragment masses for the complete range of incident neutron energies. The stopping-force-derived Zp values tend to support the unchanged charge distribution theory within uncertainty.

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En = 0.11-92.4 MeV时235U元素裂变产物产率的停止力分析
大多数评估过的元素裂变产物产率分布都没有经过实验测量。相反,大多数评估分布是基于相关累积产量的zp模型的解析表达式。本文报道了235U靶在入射中子能量从0.11 MeV到92.4 MeV范围内的独立元素裂变产物产额分布。原子序数的计算方法结合了本文开发的一种2E分析和停止力分析方法。这些分析应用于中子诱导裂变碎片跟踪实验(NIFFTE)协作裂变时间投影室(fissionTPC)中捕获的超过6.1 × 106个裂变碎片电离轨迹。利用裂变tpc的空间和能量分辨率获得了3-Z分辨率。在整个入射中子能量范围内,原子产率和实验推导出的Zp值是中子发射前碎片质量的函数。在不确定度内,由停止力导出的Zp值倾向于支持不变电荷分布理论。
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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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