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The impulse approximation is used to calculate the cross section for the reaction H + + He(1s 2 ) → H(1s) + He + (1s), for the range of incident proton energies 25 keV to 1 MeV. The results are compared with those given by Mapleton in 1961 using the Born approximation and are found to differ significantly especially in the predicted angular distributions. By estimating the probability for capture into excited states the total capture cross section is calculated and found to be in fair agreement with experimental results.
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Bransden et al. (1963) studied this question.
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