裸碳碰撞氦原子单电离全微分截面的理论分析

利用四体模型计算了100 MeV/amu裸碳碰撞氦原子单电离全微分截面，发现在散射面四体模型和实验结果符合很好，但是在散射平面外与实验数据符合有较大差别. 分析了不同散射振幅对全微分截面的贡献. 结果表明在recoil峰区域附近，由于入射粒子和靶核相互作用的振幅和入射粒子和敲出电子相互作用的振幅之间的干涉所贡献的截面更接近于实验数据，特别是在垂直平面，这两振幅的干涉所形成的截面产生了实验的双峰结构. 然而，总相互作用振幅的干涉并没有呈现这个特征. 四体模型不能给出垂直平面内实验结果的特征是由于三项散射振幅的权重不同.

Theoretical Analysis on Fully Differential Cross-Sections for C6+ Single Ionization of Helium

The four-body model has been used to calculate the fully differential cross-sections (FDCS) for the single ionization of helium by 100 MeV/amu C⁶⁺ impact in geometries. By compar-ing with experimental data and other theories, we find the results of four-body model are in very good agreement in the scattering plane, but poor agreement out of the scattering plane. Accordingly, the contributions of different scattering amplitudes to FDCS are analyzed. It is found that the cross sections due to the interference of the scattering amplitudes between projectile-target nucleus interaction and projectile-ejected electron interaction almost tend to experimental results around the recoil region in geometries. In particular in the perpen-dicular plane, the cross section originating from interference of the scattering amplitudes between projectile-target nucleus and projectile-ejected electron interactions yields an ex-perimental double-peak structure in the angular distribution. However, this feature could not be presented by the interference of the three amplitudes. Thus, the failure of the four-body model predicting the feature in this geometry may be attributed to an inappropriate weighting of the three amplitudes.