BREAKUP OF 30 MEV U-O-16 IN NUCLEAR AND COULOMB FIELDS OF SN-120 AND PB-208 NUCLEI/

Coincidence measurements of alpha-C-12 pairs collinearly emitted in th e breakup of 30 MeV/u- O-16 incident on Pb-208 and Sn-120 were perform ed with a two detector system set up along the focal plane of a magnet ic spectrograph. Double differential cross sections for sequential bre akup via the 2(2)(+) and 2(3)(+) states in O-16 were analyzed within t he framework of coupled-channels (CC) calculations which incorporated microscopic alpha-C-12 cluster model wave functions for bound and unbo und states of O-16, The experimental data are satisfactorily reproduce d by the CC calculations to within a factor of two. The results are di scussed in terms of the interference between nuclear- and Coulomb-brea kup amplitudes.