【摘要】 测量了20~55 MeV F5+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。更多还原

【Abstract】 L-shell X-ray was measured for solid target tantalum by 20-55 MeV F5+ 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.更多还原