Projectile angular-differential cross sections for single-transfer and transfer excitation have been calculated with the two-center extension of the nonperturbative basis generator method for 5-200 keV proton-helium collisions. The calculations are based on the independent electron model, and the eikonal approximation has been used to extract angular-differential cross sections from impact-parameter-dependent transition amplitudes. The present results are compared with experimental and previous theoretical data where available. In particular, we consider the ratio of transfer excitation to single capture versus double excitation to single excitation at intermediate energies. An experimentally observed structure in this ratio at a scattering angle about 0.5 mrad is qualitatively reproduced, while a previous classical evaluation failed in this respect. Therefore, we conclude that this structure is caused by quantum mechanical heavy-particle-electron couplings.
M. Zapukhlyak et al., "Projectile Angular-Differential Cross Sections for Transfer and Transfer Excitation in Proton Collisions with Helium," Physical Review A: Atomic, Molecular, and Optical Physics, American Physical Society (APS), Jan 2008.
The definitive version is available at https://doi.org/10.1103/PhysRevA.77.012720
German Academic Exchange Service (DAAD)
National Science Foundation (U.S.)
Keywords and Phrases
Collisional excitation; Collisions (Nuclear physics); Helium
Article - Journal
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