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The impulse approximation for electron transfer in reactive nucleus-atom collisions

The influence of nuclear reactions on the capture of a target electron by a light, energetic particle is described within a quantum mechanical model which combines the impulse approximation for electron capture with a two-channel formalism for the nuclear reaction. Capture probabilities are calculated for (p,p'), (p, alpha ), (d,p) and (n, alpha ) reactions and compared with the results for elastic nuclear scattering. With the exception of the (n, alpha ) reaction, large excursions of the capture probabilities are found when the collision energy is varied across the nuclear resonance. In many cases, the excursions in the reaction channel exceed those from the elastic channel.