物理学报2017，Vol.66Issue(14)：345-352,8.DOI:10.7498/aps.66.143401
高能脉冲C6+离子束激发Ni靶的K壳层X射线
K-shell X-ray emission from high energy pulsed C6+ ion beam impacting on Ni target
摘要
Abstract
Accurate measurement of the ionization cross section of the target atom induced by collision between ions and atoms is of great significance for studying the atomic shell process and establishing a suitable theoretical model. The experimental data and the theoretical models mostly concentrate on the cases in the low energy region at present. Only a few experimental data of high energy region are reported due to the limitation of experimental conditions. Which theory is more suitable to describe the ionization cross section of the inner shell of the target atom caused by the high energy heavy ions, is necessarily studied experimentally. The C6+ ions provided by the Heavy Ion Research Facility in Lanzhou Electron Cooling Storage Ring, are used to bombard the Ni target, in which the K-shell X-ray of Ni is measured. The incident energies of C6+ ions are 165, 300, 350 and 430 MeV/u respectively. Through analyzing the intensity ratio of Kβ/Kα X-ray of Ni, it is found that the influence of incident energy on the intensity ratio of Kβ/Kα X-ray is not obvious. The intensity ratios of this experiment are greater than the experimental values of incident proton and the calculated values based on the Hartree-Slater theory, which may be caused by the multiple-ionization of the L shell. The production cross sections of Ni K-shell X-ray are calculated by the binary encounter approximation (BEA) model, the plane wave Born approximation (PWBA) model and the energy-loss coulomb-repulsion perturbed-stationary-state relativistic (ECPSSR) theory respectively, which are compared with the experimental results in this paper. It is found that the experimental cross section increases with the increasing incident energy, which is consistent with the trend of BEA model estimation, but the experimental value is obviously lower than the theoretical value. We think that BEA model needs to be modified when describing the ionization process in the high energy region.关键词
X/射线/产生截面/高能脉冲束Key words
X-ray/production cross section/high energy pulsed beam引用本文复制引用
梅策香,徐戈,曾利霞,张小安,周贤明,赵永涛,任洁茹,王兴,雷瑜,孙渊博,程锐..高能脉冲C6+离子束激发Ni靶的K壳层X射线[J].物理学报,2017,66(14):345-352,8.基金项目
Project supported by the National Natural Science Foundation of China (Grant Nos. 11605147, 11505248) and the Scientific Research Program Funded by Shaanxi Provincial Education Department, China (Grant No. 15JK1793). 国家自然科学基金 (批准号: 11605147, 11505248) 和陕西省教育厅科研计划 (批准号: 15JK1793) 资助的课题. （Grant Nos. 11605147, 11505248）
