Double differential cross section of helium ionization by proton impact
Double differential cross section of helium ionization by proton impact
复制标题
质子撞击氦电离的双微分截面
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Schulz
中科院分区：
文献类型：
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作者：
A. Godunov;V. A. Schipakov;M. Schulz
本文从理论上分析了氦原子单次电离的双微分截面随散射角和入射能量损失的变化关系。我们使用了两种不同的理论方法。第一种方法涉及Faddeev-Merkuriev方程的近似解的三体库仑问题。第二种方法采用了扩展的过渡振幅在玻恩系列超过弹靶相互作用的第二阶。对于快速碰撞的情况，建立了这两种方法之间的关系。它已被证明，对于小的散射角，在带电粒子之间的最终状态的碰撞后的相互作用强烈影响的微分截面，而双散射机制占主导地位的散射角mrad。我们的计算结果与Schulz等人对50-150 keV碰撞的测量结果符合得很好。
A theoretical analysis for doubly differential cross sections of the single ionization of helium by proton impact as a function of the scattering angle and projectile energy loss is presented. We have used two different theoretical methods. The first approach involved an approximate solution of Faddeev-Merkuriev equations for the three-body Coulomb problem. The second approach employed the expansion of the transition amplitude in the Born series over the projectile-target interaction up to second order. A relation between these two methods was established for the case of fast collisions. It has been demonstrated that, for small scattering angles, the post-collision interaction in the final state between the charged particles strongly influences the differential cross sections, whereas double-scattering mechanisms dominate for scattering angles mrad. The results of our calculations are in a good agreement with the measurements of Schulz et al for 50-150 keV collisions.