Projectile break-up im continuous particle spectra from nuclear reactions induced by 156 MeV 6Li

The break-up of 156 MeV6Li ions colliding with 12C, 60Ni, 90Zr, 120Sn and 208Pb has been experimentally studied. It was found that the break-up cross section decreases rapidly with increasing emission angles of the fragments and increases with increasing target mass. It comprises a fairly fraction of the total reaction cross section. The observed features suggest that the 6Li fragmentation is mainly a peripheral process, and is dominated by the cluster properties of the incident projectile. A simple plane-wave break-up model gives a rather good description of the shapes of the break-up bumps. The angular distributions of the fragments emitted in the 6Li + 208Pb reaction reveal the transition from peripherial break-up to incomplete fusion processes by which beam-velocity fragments are captured by the target nucleus. In addition to the (α + d) dissociation the (3He + t) break-up has been observed, but the triton spectra appear to be rather complex indicating further components due to more complicated reaction paths. (orig.)