Abstract
We investigate the effect of the tensor correlation on the light neutron-rich nuclei. We extend the model space of 4He core with the shell model approach to incorporate the tensor correlation, and π-like 0− particle-hole correlation is strongly favored. This affects the LS splitting in 5He and the 0+2 state of 6He. We also investigate that the tensor correlation is suppressed in 11Li for p2 configuration of last two neutrons, which naturally mixes the s2 component in the ground state and produces the halo structure.
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