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 Ca^＋ impact in geometries. By comparing with experimental data and othe...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 Ca^＋ impact in geometries. By comparing 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 perpendicular plane, the cross section originating from interference of the scattering amplitudes between projectile-target nucleus and projectile-ejected electron interactions yields an experimental 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 fourbody model predicting the feature in this geometry may be attributed to an inappropriate weighting of the three amplitudes.展开更多
The effects of pre-equilibrium emission and secondary decay on the determination of the freeze-out volume are investigated using the isospin-dependent quantum molecular dynamics model accompanied by the statistical de...The effects of pre-equilibrium emission and secondary decay on the determination of the freeze-out volume are investigated using the isospin-dependent quantum molecular dynamics model accompanied by the statistical decay model GEMINI.Small-mass projectiles and large-mass targets with central collisions are studied at intermediate energies.It is revealed that the proton yields of pre-equilibrium emission are smaller than those of secondary decay.However,the determination of the freeze-out volume from the proton yields is more easily affected by pre-equilibrium emission.Moreover,the percentage of proton yields in the freezeout stage is found to be approxim-ately 50%.展开更多
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.11274215）, the Natural Science Foundation of Shanxi Province, China （No.20051008 and No.2010011009）, and the Technology Project of Shanxi Provincial Education Department, China （No.20111011）.
文摘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 Ca^＋ impact in geometries. By comparing 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 perpendicular plane, the cross section originating from interference of the scattering amplitudes between projectile-target nucleus and projectile-ejected electron interactions yields an experimental 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 fourbody model predicting the feature in this geometry may be attributed to an inappropriate weighting of the three amplitudes.
基金Supported by the National Natural Science Foundation of China (11905018)Scientific and Technological Innovation Programs of Higher Education Institutions of Shanxi Province,China (2019L0908)
文摘The effects of pre-equilibrium emission and secondary decay on the determination of the freeze-out volume are investigated using the isospin-dependent quantum molecular dynamics model accompanied by the statistical decay model GEMINI.Small-mass projectiles and large-mass targets with central collisions are studied at intermediate energies.It is revealed that the proton yields of pre-equilibrium emission are smaller than those of secondary decay.However,the determination of the freeze-out volume from the proton yields is more easily affected by pre-equilibrium emission.Moreover,the percentage of proton yields in the freezeout stage is found to be approxim-ately 50%.
