氟离子碰撞引起的钽L壳层X射线产生截面测量  

Measurement of L-shell X-ray Production Cross Section of Tantalum by 20-55 MeV Fluorine-Ion Bombardment

作　　者：田野[1,2] 杨治虎[3] 张艳萍[2] 常宏伟[2] 杨浩智[2] 徐进章[1] 杜树斌[2] 

机构地区：[1]兰州大学,甘肃兰州730000 [2]中国原子能科学研究院核物理研究所,北京102413 [3]中国科学院近代物理研究所,甘肃兰州730000

出　　处：《原子能科学技术》2009年第5期406-411,共6页Atomic Energy Science and Technology

摘　　要：测量了20～55 MeV F^5＋离子和Ta原子碰撞中Ta产生的L壳层X射线。计算了Ta的L各支壳层产生截面的比值和总截面的比值。利用L壳层的辐射跃迁几率、Croster-Kroning跃迁几率和L亚壳层的荧光产额，将平面波波恩近似（PWBA）和ECPSSR理论计算的电离截面转换为L层X射线产生截面，并与实验结果进行比较。结果表明，σ（Ll）/σ（Lα）、σ（Lγ）/σ（Lα）和σ（Ltotal）/σ（Lα）与ECPSSR理论预测结果吻合较好，σ（Lβ）/σ（Lα）较两种理论预测值均偏小。L-shell X-ray was measured for solid target tantalum by 20-55 MeV F^5＋ ion. The ratios of tantalum L-subshell production cross sections were calculated according to the experimental data. Radiative transition probability, Croster-Kroning transition probability and fluorescence yield were used to transfer the ionization cross section which was calculated by plane-wave Born approximation （PWBA） theory and the ECPSSR theory to L-shell X-ray production cross section. Then, the results were compared with the experimental results. Reasonable agreement between theory and experiment was observed. However, the ratio of σ（Lβ）/σ（Lα） is smaller than the values calculated by the theories of PWBA and ECPSSR.

关 键 词：平面波波恩近似 ECPSSR理论 产生截面 L壳层X射线 

分 类 号：TL562.31[核科学技术—核技术及应用]