Nuclear breakup of 8 B in a direct fragmentation model ∗

We calculate the cross sections of the elastic and inelastic breakup modes for the inclusive breakup reaction 28Si(8B,7Be) at beam energies between 10 40 MeV/nucleon within a direct fragmentation model formulated in the framework of the post form distorted-wave Born-approximation. In contrast to the case of the stable isotopes, the inelastic breakup mode is found to contribute only up to 30% to the total breakup cross section, which is in agreement with the recently measured experimental data. However, the high energy tail of the energy spectra of 7Be fragment is dominated by the inelastic breakup mode. The breakup amplitude is found to be dominated by contributions from distances well beyond the nuclear surface.