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arXiv 2602.05995nucl-exphysics.app-ph
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西科特g因子扩展到任意中子能谱

Westcott $g$ Factors Extended to Arbitrary Neutron Energy Spectra

Nuclear Science Division, Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室核科学部);Department of Nuclear Engineering, University of California at Berkeley(加州大学伯克利分校核工程系);Theoretical Division, Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室理论部)

D. A. Matters, A. M. Hurst, T. Kawano

AI总结:

本文研究了中子活化分析和即时伽马射线活化分析中非1/v行为对活化产物产率的影响,提出了一种基于任意非麦克斯韦分布谱计算西科特g因子的方法,并应用于布达佩斯研究反应堆和慕尼黑二研究反应堆的引导热中子束和冷中子束。

摘要:

西科特g因子用于中子活化分析(NAA)和即时伽马射线活化分析(PGAA)中,以评估某些核素的中子捕获截面非1/v行为对活化产物产率的影响。这种非1/v行为源于中子捕获截面中存在与低能(<5 eV)中子源谱重叠的中子共振。历史上,用于NAA和PGAA应用的西科特g因子是基于假设麦克斯韦中子速度分布和给定平均温度的计算结果。在本研究中,我们使用这种方法,结合更新的中子捕获截面数据(Evaluated Nuclear Data File,版本VIII.1,ENDF/B-VIII.1)来列出适用于广泛麦克斯韦分布温度范围的西科特g因子值,并将其结果与现有国际原子能机构表格和其他来源的g因子进行比较。在此次分析中发现,某些设施使用引导热中子束和冷中子束时,需要一种基于任意非麦克斯韦谱评估西科特g因子的方法。在本文中,我们提出了一种计算基于用户指定中子谱的g因子的方法,并应用这些方法得到布达佩斯研究反应堆和慕尼黑二研究反应堆的引导热中子束和冷中子束的西科特g因子。本研究还开发了开源软件,可用于PGAA和NAA实验中的这些计算。

英文摘要:

Westcott $g$ factors are used in Neutron Activation Analysis (NAA) and Prompt Gamma-ray Activation Analysis (PGAA) to evaluate the impact of non-$1/v$ behavior in the neutron-capture cross sections of certain nuclei on activation product yields. This non-$1/v$ behavior arises from the presence of neutron resonances in the neutron-capture cross sections that overlap with the source neutron spectrum at low ($<5$~eV) energies. Historically, Westcott $g$ factors that have been cataloged for NAA and PGAA applications are the result of calculations that assume a Maxwellian neutron velocity distribution with a given average temperature. In this study, we use this approach with updated neutron-capture cross sections from the Evaluated Nuclear Data File, version VIII.1 (ENDF/B-VIII.1) to tabulate Westcott $g$ factor values for a broad range of Maxwellian distribution temperatures, comparing the results against currently-available $g$ factors from International Atomic Energy Agency tables and other sources. It was discovered during this analysis that the use of guided thermal and cold-neutron beams at certain facilities necessitates an approach for evaluating Westcott $g$ factors based on arbitrary non-Maxwellian spectra. In this paper, we present an approach for calculating $g$ factors with user-specified neutron spectra, and we apply these methods to obtain Westcott $g$-factors for guided- and cold-neutron beams at the Budapest Research Reactor and the Forschungsreaktor M{ü}nchen II reactor. Open-source software has been developed as part of this study that can be used to perform these calculations for applications in PGAA and NAA experiments

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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