272 Progress of Theoretical Physics Supplement No. 154, 2004 Breakup Processes in the Systems 9Be+208Pb,209Bi and 6Li+208Pb around the Coulomb Barrier

From recent experimental data for the systems 9Be+208Pb,209Bi and 6Li+208Pb it results that the complete fusion process is hindered with respect to realistic theoretical predictions (CCFUSS). However the 9Be+208Pb,209Bi complete fusion cross sections are different from each other contrary to expectations. The 6Li data show breakup of the projectile into two outgoing fragments, well reproduced by CDCC approach, as well as α or deuteron capture from the target; this is relevant for the theories on the reaction dynamics around the Coulomb barrier. In this contribution we want to discuss the interaction at Coulomb barrier en-ergies of the two most loosely bound stable projectiles (9Be and 6Li) at the light of recent experimental data and related theories. These nuclei play an important role as link to the light radioactive ion beams like 11Be, 6He, 8B and the future ones even more loosely bound with additional halo or skin structure. The nuclei 9Be and 6Li, loosely bound by 1.57 and 1.47 MeV respectively, but still stable, al-low to perform experiments with statistical accuracy much higher than what can be presently achieved with radioactive ion beams; this can give good hints about ho