EXCHANGE CONTRIBUTIONS TO NUCLEUS-NUCLEUS POTENTIALS DEDUCED FROM RGMPHASE-SHIFTS USING INVERSION

We have determined, for certain representative cases, the representati on in terms of local potential of the contribution to the nucleus-nucl eus interaction of one-nucleon exchange, core exchange and intermediat e exchange terms. We do this by applying S-l-to-V(r) inversion, using the IP method, to phase shifts from RGM calculations of Fujiwara and T ang, and LeMere et al. For t alpha at 18 MeV we find a shape parity de pendence which is identical in nature to that found in other cases rec ently. For He-3+alpha at 60 MeV, a strong parity shape dependence stil l occurs, but of slightly different form. For alpha+O-16, the 4N excha nge generates a small parity dependence of the same nature, but this s eems to disappear in the full RGM calculation. In the last two cases, we show the characteristic forms of potentials due to the different ex change terms. These calculations indicate the scope of inversion as a means of extracting information from microscopic calculations concerni ng the nucleus-nucleus interaction.