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.     

中高能入射条件下裸碳离子碰撞氦原子单电离的全微分截面

利用四体模型计算了100 和 2 MeV/amu裸碳单电离氦原子的全微分截面,其结果与实验数据和其它理论进行了比较。对于高能入射情况,在散射平面小动量转移和中间动量转移时现在的理论结果和实验符合的很好,然而在大动量转移时和在垂直平面有明显差异。对于低能入射情况,四体结果定性与实验结果一致,而且优于三体扭曲波(3DW-EIS)结果,表明四体效应在低能入射比在高能入射时明显。     

Theoretical analysis on fully differential cross sections for C~(6+)impact ionization of helium

Fully differential cross sections （FDCS） are calculated within a four-body model for single ionization of helium by C6＋ impact at the incident energy of 100 MeV/a.u. （atomic unit）. The results are compared with experimental data and other theoretical predictions. It is shown that our results are in very good agreement with experiment for three small momentum transfers in the scattering plane; however, some significant discrepancies are still present at the largest momentum transfer in both the scattering plane and the perpendicular plane. In actuality, the problem has not been explained by the theory during the last decade. Accordingly, the contributions of different scattering amplitudes to FDCS are analyzed. It is found that for the largest momentum transfer the cross section arising from a destructive interference of the three amplitudes is much smaller than the experimental data. However, the cross section due to the constructive interference of two scattering amplitudes between projectile-ionized electron interaction and projectile-passive electron interaction almost approaches the experimental data.     

中高能入射条件下裸碳离子碰撞氦原子单电离的全微分截面(英文)

利用四体模型计算了100和2MeV/amu裸碳单电离氦原子的全微分截面,其结果与实验数据和其它理论进行了比较.对于高能入射情况,在散射平面小动量转移和中间动量转移时现在的理论结果和实验符合的很好,然而在大动量转移时和在垂直平面有明显差异.对于低能入射情况,四体结果定性与实验结果一致,而且优于三体扭曲波(3DW-EIS)结果,表明四体效应在低能入射比在高能入射时明显.