DISTORTED-WAVE MODELS FOR ELECTRON-CAPTURE IN ASYMMETRIC COLLISIONS .2. DIFFERENTIAL CROSS-SECTIONS AND THE DOUBLE SCATTERING REGION

We study the single-electron capture process by impact of protons on hydrogen atoms, at intermediate and high collision energies. The emphasis is on differential cross sections for capture to specific nlm final states. The calculations use three distorted-wave models, a symmetric one (continuum distorted-wave approximation) and two asymmetric ones (continuum distorted-wave-eikonal initial state and eikonal final-state approximations). The various sets of differential cross sections are presented and compared to available experimental data. Distinguishing features appear most notably in the double scattering region revealing the different physical content of the approximations. An analysis of the post-prior discrepancy in the asymmetric models is sketched and the validity of a previously introduced criterion to select the appropriate distorted-wave model in a specific collision is also discussed.