COULOMB-EXCITATION OF SOFT DIPOLE STATES IN HE-6 AND LI-11 AND ITS EFFECTS ON THE ELASTIC-SCATTERING

The Coulomb excitation of the soft-dipole mode (SDM) and its dynamical effect on the elastic scattering of halo nuclei, He-6 and Li-11 at E( lab)/A(P)=5 similar to 70 MeV, are investigated in the microscopic cou pled-channel (CC) method. The Goldhaber-Teller (GT) model is employed to calculate the transition density for SDM. The proton and neutron de nsity distributions as well as the dipole-transition strengths, which are the input to the GT model, are given by the coupled-rearrangement- channel variational method based on an a + n + n three-body model for He-6, and by a Li-9 + dineutron two-cluster-model calculation for Li-1 1. The results of the CC calculations show that the effect of the Coul omb excitation of SDM on the elastic scattering is suite significant, while the nuclear contribution is relatively small. We also investigat e the characteristics of the Coulomb-dissociation cross sections, such as the energy dependence and the target dependence in the same model.