Four-body DWBA calculations of the Coulomb breakup of 6He

We investigate the Coulomb breakup of the two-neutron-halo nucleus He-6 by extending the framework of the finite-range postform. distorted-wave Born approximation theory introduced earlier for the description of the breakup of one-neutron-halo nuclei. The model can use the realistic three-body wave function for the He-6 ground state. Calculations have been performed for energy, total and parallel momentum distributions of He-4 fragment. The two-body He-4-neutron and neutron-neutron correlations have also been calculated. Our results are compared with those of an adiabatic model of the Coulomb-breakup reactions. The two theories lead to almost identical results. Comparisons are also made with the available experimental data. It is found that the pure Coulomb breakup can describe the bulk of the data taken at below grazing angles. However. a rigorous description of all the available data requires the consideration of the nuclear-breakup effects. (C) 2001 Elsevier Science B.V. All rights reserved.