The total cross sections for electron capture of protons in atomic and molecular hydrogen and in helium gas targets are measured in the high proton velocity regime of 2.0, 3.5, 5.0 and 7.5 MeV. The results are compared with first- and higher-order perturbation theories (Oppenheimer-Brinkmann-Kramers, true first Born approximation, eikonal approximation, continuum distorted wave, strong potential Born, strong potential Born full peaking) for electron capture and are found to be in good agreement with the CDW, EA and TFBA approximations.
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Schwab et al. (1987) studied this question.
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