ANTISYMMETRY AND CHANNEL COUPLING CONTRIBUTIONS TO THE ABSORPTION FORP+ALPHA D+HE-3/

To understand recently established empirical p+alpha potentials, RGM c alculations followed by inversion are made to study contributions of t he d+He-3 reaction channels and deuteron distortion effects to the p+a lpha potential. An equivalent study of the d+He-3 potential is also pr esented. The contributions of exchange non-locality to the absorption are simulated by including an phenomenological imaginary potential in the RGM. These effects alone strongly influence the shape of the imagi nary potentials for both p+alpha and d+He-3. The potentials local-equi valent to the fully antisymmetrised-coupled channels calculations have a significant parity-dependence in both real and imaginary components , which for p+alpha is qualitatively similar to that found empirically . The effects on the potentials of the further inclusion of deuteron d istortion are also presented. The inclusion of a spin-orbit term in th e RGM, adds additional terms to the phase-equivalent potential, most n otably the comparatively large imaginary spin-orbit term found empiric ally. (C) 1997 Elsevier Science B.V.