Abstract
We give a simple and transparent derivation of a result obtained recently by Kim, Udagawa, and Tamura for the loss of flux occurring in the coupled-channels scattering problem when a complex potential is used. The loss of flux, or absorption cross section, consists of three components: absorption from the elastic channel, absorption from the nonelastic channels, and absorption occurring during the elastic-nonelastic transitions. Some discussion is given of these results and their application to fusion reactions.
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