A hybrid random-phase-approximation–cluster model is developed and applied to the calculation of the dipole response of ${}_{}{}^{11}{}_{}{}^{}\mathrm{Li}$. A strong collective state at 1.81 MeV is found. Its width is predicted to be ≊4.0 MeV. The electromagnetic excitation cross section was found to be 700 mb for ${}_{}{}^{11}{}_{}{}^{}\mathrm{Li}$${+}^{208}$Pb (E=800 MeV/nucleon), close to the experimental result.

• Received 6 September 1990

DOI:https://doi.org/10.1103/PhysRevC.43.R2049