Coulomb Excitation of Soft Dipole States in ⁶He and ¹¹Li and Its Effects on the Elastic Scattering

Abstract

The Coulomb excitation of the soft-dipole mode (SDM) and its dynamical effect on the elastic scattering of halo nuclei, ⁶He and ¹¹Li at E_1ab/A_P = 5 ∼70 MeV, are investigated in the microscopic coupled-channel (CC) method. The Goldhaber-Teller (GT) model is employed to calculate the transition density for SDM. The proton and neutron density distributions as well as the dipoletransition strengths, which are the input to the GT model, are given by the coupled-rearrangement-channel variational method based on an α+ n + n three-body model for ⁶He, and by a ⁹Li + dineutron two-cluster-model calculation for ¹¹Li. The results of the CC calculations show that the effect of the Coulomb excitation of SDM on the elastic scattering is quite significant, while the nuclear contribution is relatively small. We also investigate the characteristics of the Coulomb-dissociation cross sections, such as the energy dependence and the target dependence in the same model.

Citing Article(s):

1. Progress of Theoretical Physics Vol. 102 No. 6 (1999) pp. 1133-1149

   Soft Dipole Resonance in ¹¹Li Rituparna Kanungo, Isao Tanihata and Chhanda Samanta

© Copyright (c) 1995 Progress of Theoretical Physics 1995