Mechanism of Coulomb breakup reactions of two-neutron halo nuclei 6He and 11Li

Abstract

We investigate the three-body Coulomb breakup reactions of two-neutron halo nuclei and discuss the correlations of every binary subsystem such as of core-n and n-n by showing the invariant mass spectra. It is found that the final-state interactions of core-n and n-n binary subsystems dominantly determine the observed energy distributions of the breakup cross sections, such as the low-lying enhancements. Furthermore, we investigate the effects of the 9Li core excitations on the Coulomb breakup cross section of 11Li. It is shown that the integrated E1 strength at low energy region is reduced by ~ 15 % by the inclusion of the 9Li core excitations.