Abstract
In addition to the Thomas peak, occurs at 0.47 mrad, another peak has been observed at ≈ 0.75 mrad in a recent measurement for projectile angular differential cross sections of single electron capture in proton-helium collision at impact energies of MeV region [M. Gudmundsson et al., J. Phys. B 43, 185209 (2010)]. Stimulated by this report, the differential cross section is calculated based on the first Born approximation for single ionization of helium by proton impact. Calculations with and without inter-electron correlation give almost the same results, and the peak observed experimentally near 0.75 mrad is not accounted for in the treatment.
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Igarashi, A., Gulyás, L. & Ohsaki, A. Projectile angular distribution in single electron capture from helium by fast protons. Eur. Phys. J. D 66, 79 (2012). https://doi.org/10.1140/epjd/e2012-20722-4
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DOI: https://doi.org/10.1140/epjd/e2012-20722-4