  We investigate the Coulomb breakup of the two-neutron halo nucleus 6He by
extending the framework of the finite range post form 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 6He ground state. Calculations have been performed for energy,
total and parallel momentum distributions of 4He fragment. The two-body
4He-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.
