QUASI-ELASTIC SCATTERING OF B-8 AND BE-7 ON C-12 AT 40 MEV/NUCLEON

The quasielastic scattering of the exotic nucleus B-8 on a C-12 target has been studied at an energy of 320 MeV and compared with that of Be-7 at the same velocity. The quasielastic scattering of C-12+C-12 at 20 MeV/nucleon, also performed as a secondary beam experiment, was used to check the data reduction method. The results are interpreted in terms of a semimicroscopic double folding model and coupled-channels calculation. The difference in the total reaction cross section (8%) between B-8 and Be-7 is consistent with the measured one proton removal cross section and corresponds to an increase in the interaction radius of 4%. The existence of a substantial proton halo in B-8 is not supported by the present data.