Xe54+离子与Xe原子碰撞过程中的辐射电子俘获及退激发辐射的理论研究

摘要

基于多组态Dirac-Fock理论方法和冲量近似,对Xe54+与Xe在197 MeV/u碰撞能量下,炮弹离子的俘获及退激发过程进行了理论研究。计算了炮弹离子从中性靶原子俘获一个电子到nl (n=1,2,3,4,5；l=s, p, d)轨道上的辐射电子俘获截面和相应的辐射光子能量,以及俘获末态退激发辐射跃迁的能量和概率。结合这些计算结果,进一步模拟了碰撞产生的炮弹离子的退激发X射线谱的结构,并与兰州重离子加速器装置上的最新实验观测结果进行了比较,符合得很好。%Based on the multiconfiguration Dirac-Fock method and impulse approximation, the electron capture and following radiation decay of the projectile ion are studied theoretically for Xe atom which is bombarded by Xe54+ion at 197 MeV/u. The radiative electron capture (REC) cross-sections and the corresponding emitted photon energies have been calculated in detail. Meanwhile, the probabilities of the radiative decay and energies of the REC final states are also calculated;combined with the calculated results in this paper, the X-ray spectra structure of radiative decay from projectile ion is further simulated. It is found that the simulated spectra are in good agreement with the newly measured results at Lanzhou Heavy-Ion Accelerator Device.