物理学报2025，Vol.74Issue(7)：57-64,8.DOI:10.7498/aps.74.20241660
中子诱发52Cr非弹性散射截面测量
Neutron-induced inelastic scattering cross-section measurement of 52Cr
摘要
Abstract
With the development of next-generat ion reactors,the demand for higher precision in nuclear data has increased significantly to ensure operational efficiency and safety.Especially,inelastic scattering cross-section is one of the key parameters in nuclear reactor physics calculations,which directly affects neutron economy,thermal-hydraulic design,and safety analysis.Stainless steel is widely used in the nuclear industry.Chromium(Cr)is one of the main alloying elements in stainless steel,and 52Cr is the most abundant isotope in nature.However,the measurement of the inelastic scattering cross-section of 52Cr has not been explored in China,so the study of the 52Cr(n,n'γ)reaction cross-section is crucial for nuclear reactor calculations.In this study,the neutron beams with energies of 5.62,6.24,and 7.95 MeV via the D(d,n)3He reaction are generated from the HI-13 tandem accelerator at the Institute of Atomic Energy in China.These neutrons are used to bombard a 52Cr target.Four CLOVER detectors are located at 30°,70°,110° and 150° relative to the beam direction in the horizontal plane.The prompt γ-ray method is used to measure the inelastic scattering cross-section by using an HPGe detector array.This is the first time that the cross-sections of five inelastic γ-rays with energies of 647.47 keV,935.54 keV,1333.65 keV,1434.07 keV and 1530.67 keV have been obtained experimentally in China.Additionally,theoretical model calculations are performed to determine the inelastic scattering cross-sections of neutrons with energies below 20 MeV interacting with 52Cr.In the analysis of the experimental data,γ-ray self-absorption correction,neutron flux attenuation and multiple scattering correction are considered.The total experimental uncertainty includes the measurement uncertainty,correction term uncertainty,and standard cross-section uncertainty.The results show that the γ-ray production cross-sections obtained at the three neutron energy points are in good agreement with the data measured by Mihailescu et al.[Mihailescu L C,Borcea C,Koning A J,Plompen A J M 2007 Nucl.Phys.A 786 1]within the error margins,and the uncertainties are smaller.However,significant discrepancies are observed between the theoretical model calculations and the experimental data,which may be attributed to the lack of experimental information about the high-excitation-energy levels in the 52Cr level scheme.This study not only fills a gap in the measurement of the 52Cr inelastic scattering cross-section but also provides important nuclear data for designing and optimizing the next-generation reactors.关键词
中子非弹性散射/γ产生截面/瞬发γ射线法/高纯锗探测器Key words
neutron inelastic scattering/γ-ray production cross-section/prompt γ ray method/high purity germanium detector引用本文复制引用
谭博宇,刘颖一,王金成,陶曦,阮锡超,王朝辉,吴鸿毅,韩银录,肖石良,王昊,汪文烨,王记民,李昱兆..中子诱发52Cr非弹性散射截面测量[J].物理学报,2025,74(7):57-64,8.基金项目
稳定支持基础科研计划(批准号:BJ010261223282)资助的课题. Project supported by the Continuous-Support Basic Scientific Research Project,China(Grant No.BJ010261223282). （批准号:BJ010261223282）
