Abstract
The effect of coupling to channels other than those representing scattering in the initial and final states is investigated. Necessary and sufficient conditions are obtained for such couplings to be small and the extent to which these conditions are valid is examined for (d, p), (t, p) and (d, α) reactions. It is concluded that only (d, p) reactions are likely to be well described by the usual DWBA theory which ignores these couplings. Plausible arguments are given to account for the empirical agreement between experiment and the cut off DWBA theory.
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