Breakup processes of 6,7Li projectiles from a 208Pb target at Coulomb barrier energies

Large \u3b1 production cross sections were measured for the systems 6,7Li+208Pb; they were identified with the total breakup cross sections. A theoretical description based on coupled channels method, also including coupling to a discretized continuum, underestimates the experimental data. These large cross sections, also found for the systems 6He,9Be+209Bi, originate from the low binding energies of these light nuclei. The total reaction cross sections for these systems, deduced from the elastic scattering, coincide with the fusion + breakup ones