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氟离子碰撞引起铅原子L壳层X射线产生截面的实验测量

Measurement of L-Shell X-ray Production Cross Section of Pb by Fluorine Ion Bombardment

    摘要
  • 摘要: 实验测量了20～50 MeV的F离子碰撞Pb原子产生的L壳层X射线，研究了Pb的L各支壳层X射线产生截面σ（Ll）、σ(Lα)、σ（Lβ）、σ（Lγ）和σ（Ltot）与入射离子能量的关系。结果显示：在本能区范围内，Pb原子发射L壳层X射线产生截面随入射离子能量的增加而增加。利用L壳层的辐射跃迁几率、CosterKronig跃迁率和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，并与实验结果相比较。结果表明，σ（Ll）、σ(Lα)、σ（Lβ）、σ（Lγ）、σ（Ltot）实验测量值与PWBA理论计算值差别很大，ECPSSR理论计算值与σ(Lα)实验值符合很好，与σ（Ll)、σ（Lβ）的实验值差别较小，但与σ（Lγ）的实验值差别较大。

     

    Abstract: Production cross section of Pb L-shell X-ray induced by 2050 MeV F5+ ion was measured, and the relationship of X-ray production cross section and impact ion energy was represented. At the same time, inner-shell ionization cross sections given by plane-wave Born approximation (PWBA) theory and the ECPSSR theory were transformed to L-subshell X-ray production cross section by using radiative transition probability, Coster-Kronig transition probability and fluorescence yield. The results were compared with the experimental results. It shows that reasonable agreement between theory and experiment is observed, and the ECPSSR theory is closer to the experiment.

     

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