Cross section determination of 27Al(n,2n)26Al reaction induced by 14-MeV neutrons uniting with D-T neutron activation and AMS techniques

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Science and Techniques Pub Date : 2024-06-18 DOI:10.1007/s41365-024-01451-z
Xian-Lin Yang, Chang-Lin Lan, Yu-Ting Wei, Yi Zhang, Gong Jiang, Bo Xie, Yu Liu, Hong-Tao Shen, Xiao-Jun Sun
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Abstract

Aluminum is the primary structural material in nuclear engineering, and its cross section induced by 14-MeV neutrons is of great significance. To address the issue of insufficient accuracy for the \(^{27}\hbox {Al}\)(n,2n)\(^{26}\hbox {Al}\) reaction cross section, the activation method and accelerator mass spectrometry (AMS) technique were used to determine the \(^{27}\hbox {Al}\)(n,2n)\(^{26}\hbox {Al}\) cross section, which could be used as a D-T plasma ion temperature monitor in fusion reactors. At the China Academy of Engineering Physics, neutron activation was performed using a K-400 neutron generator produced by the T(d,n)\(^{4}\hbox {He}\) reaction. The \(^{26}\hbox {Al}/^{27}\hbox {Al}\) isotope ratios were measured using the newly installed GYIG 1 MV AMS at the Institute of Geochemistry, Chinese Academy of Sciences. The neutron flux was monitored by measuring the activity of \(^{\mathrm{92\,m}}\hbox {Nb}\) produced by the \(^{93}\hbox {Nb}\)(n,2n)\(^{\mathrm{92\,m}}\hbox {Nb}\) reaction. The measured results were compared with available data in the experimental nuclear reaction database, and the measured values showed a reasonable degree of consistency with partially available literature data. The newly acquired cross-sectional data at 12 neutron energy points through systematic measurements clarified the divergence, which has two different growth trends from the existing experimental values. The obtained results are also compared with the corresponding evaluated database, and the newly calculated excitation functions with TALYS\(-\)1.95 and EMPIRE\(-\)3.2 codes, the agreement with CENDL\(-\)3.2, TENDL-2021 and EMPIRE\(-\)3.2 results are generally acceptable. A substantial improvement in the knowledge of the \(^{27}\hbox {Al}\)(n,2n)\(^{26}\hbox {Al}\) reaction excitation function was obtained in the present work, which will lay the foundation for the diagnosis of the fusion ion temperature, testing of the nuclear physics model, evaluation of nuclear data, etc.

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利用 D-T 中子活化和 AMS 技术测定 14-MeV 中子诱导的 27Al(n,2n)26Al 反应的横截面
铝是核工程中的主要结构材料,其在 14-MeV 中子诱导下的截面具有重要意义。为了解决 \(^{27}\hbox {Al}\)(n,2n)\(^{26}\hbox {Al}\) 反应截面精度不够的问题、活化法和加速器质谱技术确定了(^{27}hbox {Al})(n,2n)/(^{26}hbox {Al})反应截面,该截面可用作聚变反应堆中D-T等离子体离子温度监测器。在中国工程物理研究院,使用由T(d,n)\(^{4}\hbox {He}\)反应产生的K-400中子发生器进行了中子活化。使用中国科学院地球化学研究所新安装的 GYIG 1 MV AMS 测量了 \(^{26}\hbox {Al}/^{27}\hbox {Al}/)同位素比。通过测量由(^{93}\hbox {Nb}\)(n,2n)\(^{mathrm{92,m}\hbox {Nb}\)反应产生的\(^{mathrm{92,m}\hbox {Nb}\) 的活度来监测中子通量。测量结果与核反应实验数据库中的可用数据进行了比较,测量值与部分可用文献数据显示出合理程度的一致性。通过系统测量新获得的 12 个中子能量点的截面数据澄清了分歧,分歧与现有实验值有两种不同的增长趋势。获得的结果还与相应的评估数据库进行了比较,新计算的激发函数与 TALYS\(-\)1.95 和 EMPIRE\(-\)3.2 代码进行了比较,与 CENDL\(-\)3.2, TENDL-2021 和 EMPIRE\(-\)3.2 结果的一致性总体上是可以接受的。本研究对(^{27}\hbox {Al}\)(n,2n)\(^{26}\hbox {Al}\)反应激发函数的认识有了实质性的提高,这将为聚变离子温度的诊断、核物理模型的检验、核数据的评估等奠定基础。
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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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