AMBIGUITIES IN THE ELASTIC-SCATTERING POTENTIALS FOR 350 MEV LI-7 IONS ON C-12 AND SI-28

The differential cross sections from the scattering of 350 MeV Li-7 io ns from C-12 and from Si-28 have been analyzed by both a global and a numerical inverse scattering theory. Statistically significant fits to both high quality data sets have been found from which the associated effective local interaction potentials between the colliding ions hav e been deduced. The interactions obtained by the different approaches are radically different. A priori physical information about the natur e of realistic effective interactions is required to ascertain which, if any, is the most reasonable one for use in analyses of other reacti on data from these systems.