Study of the effects of nuclear and Coulomb interactions in the breakup of 19C on 208Pb

Abstract

A detailed partial wave analysis of the breakup of 19C on 208Pb at 67 MeV/A is performed to investigate the effects of the nuclear and Coulomb breakups. It is first shown that the breakup cross sections are dominated by p-waves, but all the outgoing neutrons are not necessarily in the p-waves. The contributions of the other partial waves are important and account for the normalization of the breakup cross section. The nuclear contribution is not negligible for angles below and in fact both nuclear and Coulomb breakups contribute equally between and . The incoherent difference of the full (coherent sum of nuclear and Coulomb breakups) and nuclear breakup cross sections agree with the data for low excitation energies. However, the full breakup cross section alone describes well the data for high excitation energies. We found that the small nuclear contribution does not directly imply small nuclear–Coulomb interferences, which was generally found to be destructive regardless whether the continuum–continuum couplings are included or not.