REFRACTIVE SCATTERING AND REACTIONS, COMPARISON OF 2 SYSTEMS - O-16-16 AND NE-20+C-12(O)

Elastic, inelastic scattering as well as one-neutron transfer channels have been measured over a wide angular range for systems O-16 + O-16 at the incident energy of 350 MeV and Ne-20 + C-12 at 390 MeV, respect ively, using the Q3D magnetic spectrometer. In both cases differential cross sections have been measured down to about 50 nb/sr (or dsigma/d sigma(R) less-than-or-equal-to 10(-4)) at large angles. For the O-16 O-16 system refractive contributions are found at the level of these cross sections, whereas in the Ne-20 + C-12 case a steeper decrease of the differential cross section with the angle is observed and the ref ractive contribution can not be determined. The elastic scattering dat a have been analyzed using standard Woods-Saxon potentials and potenti als calculated in different versions of the double-folding model. Some properties of these potentials are tested in the calculations for ine lastic scattering and one-neutron transfer within the DWBA. With the r efractive pattern observed for the O-16 + O-16 system, the scattering and transfer data are found to be sensitive to the interaction potenti al at small internuclear distances down to about 2.5 fm.