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 h ydrogen atoms, at intermediate and high collision energies. The emphas is 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-stat e 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 revealin g the different physical content of the approximations. An analysis of the post-prior discrepancy in the asymmetric models is sketched and t he validity of a previously introduced criterion to select the appropr iate distorted-wave model in a specific collision is also discussed.