We extend the standard distorted wave Born approximation(DWBA)to include the second-order Born amplitude in order to describe the multiple interactions between a projectile and an atomic target.Both the first-and seco...We extend the standard distorted wave Born approximation(DWBA)to include the second-order Born amplitude in order to describe the multiple interactions between a projectile and an atomic target.Both the first-and secondorder DWBA models are used to calculate triply differential cross sections(TDCS)of coplanar(e,2e)on atomic argon with the scattered electron energy fixed at 500eV,the scattering angle at 6°and the ejected electron energies at 37,74 and 205 e V.Overall agreements with experimental measurements have been obtained in shape,and the second-order DWBA model improves the calculations as expected,especially for recoil peak of TDCS.展开更多
An application of the coupled-channels optical method is given for the energy-dependent phenomena of positron- hydrogen resonances below the n = 2 excitation threshold. The equivalent local optical potential is used t...An application of the coupled-channels optical method is given for the energy-dependent phenomena of positron- hydrogen resonances below the n = 2 excitation threshold. The equivalent local optical potential is used to account for the target polarization and positronium formation. The calculation includes 9 explicitly physical coupled channels. The lowest S-wave resonance energy position and new resonances are found. Angular dependence of the cross section in the resonance region are investigated.展开更多
A new calculation for the total cross section of positron-sodium scattering is performed in an energy range down to a few tenths of one electron volt using the coupled-channel optical method. The ionization continuum ...A new calculation for the total cross section of positron-sodium scattering is performed in an energy range down to a few tenths of one electron volt using the coupled-channel optical method. The ionization continuum and the positronium formation channels are included via an equivalent-local complex potential. The role played by the break-up and rearrangement processes in the low energy positron-sodium scattering is also investigated. The total scattering cross section is reported and compared with the available theoretical and experimental data.展开更多
We investigate high partial wave resonances in positron-hydrogen scattering using the momentum-space coupledchannels optical method above the H (n =2) threshold.Resonances with angular momenta of L =0-6 are reported.I...We investigate high partial wave resonances in positron-hydrogen scattering using the momentum-space coupledchannels optical method above the H (n =2) threshold.Resonances with angular momenta of L =0-6 are reported.Ionization continuum and positronium formation channels are included via a complex equivalent local potential.Comparisons with the existing theoretical results are presented.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10874035 and 11174066the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology.One of us(Y Wang)is grateful for the Project(HIT.NSRIF.2009161).
文摘We extend the standard distorted wave Born approximation(DWBA)to include the second-order Born amplitude in order to describe the multiple interactions between a projectile and an atomic target.Both the first-and secondorder DWBA models are used to calculate triply differential cross sections(TDCS)of coplanar(e,2e)on atomic argon with the scattered electron energy fixed at 500eV,the scattering angle at 6°and the ejected electron energies at 37,74 and 205 e V.Overall agreements with experimental measurements have been obtained in shape,and the second-order DWBA model improves the calculations as expected,especially for recoil peak of TDCS.
基金Project supported by the National Natural Science Foundation of China(Grant No.10674055)
文摘An application of the coupled-channels optical method is given for the energy-dependent phenomena of positron- hydrogen resonances below the n = 2 excitation threshold. The equivalent local optical potential is used to account for the target polarization and positronium formation. The calculation includes 9 explicitly physical coupled channels. The lowest S-wave resonance energy position and new resonances are found. Angular dependence of the cross section in the resonance region are investigated.
基金Project supported by the National Natural Science Foundation of China(Grant No.10674055)
文摘A new calculation for the total cross section of positron-sodium scattering is performed in an energy range down to a few tenths of one electron volt using the coupled-channel optical method. The ionization continuum and the positronium formation channels are included via an equivalent-local complex potential. The role played by the break-up and rearrangement processes in the low energy positron-sodium scattering is also investigated. The total scattering cross section is reported and compared with the available theoretical and experimental data.
基金Supported by the National Natural Science Foundation of China under Grant No 10674055.
文摘We investigate high partial wave resonances in positron-hydrogen scattering using the momentum-space coupledchannels optical method above the H (n =2) threshold.Resonances with angular momenta of L =0-6 are reported.Ionization continuum and positronium formation channels are included via a complex equivalent local potential.Comparisons with the existing theoretical results are presented.
