Internuclear Interaction And Distorting Potential Effects On Fully Differential Cross Section For C⁶⁺ Single Ionization Of Helium

The modified Coulomb-Born approximation including the internuclear interaction(MCB-NN)with a full quantum-mechanical way,and the previous semiclassical MCB model(without the internuclear interaction),is applied to calculate the fully differential cross section(FDCS)for single ionization of helium by 100 MeV/amu C6+impact in all geometries.The present results are compared with the experimental data and the 3DW and the 4CW results.It is showed that,for the same momentum transfer,the MCB-NN theory provides better results for small azimuthal angle.With the increasing momentum transfer,the MCB results are in better agreement with the experiments.In particular,the MCB theory predicts the “double-peak”structure in the perpendicular plane.For the different momentum transfer,the MCB-NN(MCB)calculations yield good agreement with experiments for the small(large)momentum transfer.To study the physical origin of the features in the FDCS,the influence of the internuclear interaction and the distorting potential effects on the FDCS are analyzed in detail.It turns out that the distorting potential effects play an important(unimportant)role on the FDCS without(with)the internuclear interaction.