USING INVERSE SCATTERING METHODS TO STUDY INTER-NUCLEUS POTENTIALS

It is now straightforward to carry out S-matrix to potential inversion over a very wide range of energies and for a wide range of projectile -target combinations. Inversion is possible in many cases involving sp in. Iterative perturbative inversion also permits direct scattering da ta-to-potential inversion and furnishes powerful tools for the phenome nological analysis of nuclear scattering. The resulting single panicle potentials exhibit various,generic properties which challenge fundame ntal reaction theories as well as yield information on densities, prov ide input for reaction calculations. S-matrix-to-potential inversion i s also a powerful tool for directly investigating theoretical processe s which contribute to internuclear potentials. Various studies have gi ven insight into contributions to the dynamic polarization potential t hat are due to breakup processes and/or collective and reaction channe l coupling and have also illuminated the role played by exchange proce sses in leading to non-locality and parity dependence of the potential s. A case study involving d + He-4 is a model for ways in which invers ion applied jointly to theory and experiment might illuminate the scat tering of exotic nuclei.