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Semiclassical approximation to the two-step direct nucleon-nucleus reaction.

We extend the semiclassical approach which was implemented successfully for the one-step direct reaction to the two-step process. Using essentially the same approximations as in a previous paper by Luo and Kawai, we obtain a closed parameter-free formula for the two-step cross section. This formula contains experimental nucleon-nucleon cross sections and distorted-wave intensities, and is physically interpreted.