Coulomb breakup reactions of 11Li in the coupled-channel 9Li + n plus n model

We investigate the three-body Coulomb breakup of a two-neutron halo nucleus Li-11. We use the coupled-channel Li-9 + n + n three-body model, which includes the coupling between last neutron states and the various two-particle-two-hole (2p-2h) configurations in Li-9 due to the tensor and pairing correlations. The three-body scattering states of Li-11 are described by using the combined methods of complex scaling and the Lippmann-Schwinger equation. The calculated breakup cross section successfully reproduces the experiments. The large mixing of the s state in the halo ground state of Li-11 is shown to play an important role in the explanation of shape and strength of the breakup cross section. In addition, we predict the invariant mass spectra for binary subsystems of Li-11. It is found that the two kinds of virtual s states of Li-9-n and n-n systems in the final three-body states of Li-11 largely contribute to make low-lying peaks in the invariant mass spectra. On the other hand, in the present analysis, it is suggested that the contributions of the p-wave resonances of Li-10 are hardly confirmed in the spectra. DOI: 10.1103/PhysRevC.87.034606