Abstract
The binding mechanism and excitations of 6 He, 10 He and 11 Li neutron-rich nuclei are investigated by using core( 4 He, 8 He or 9 Li)+n+n three-body models. Both of the dineutron like correlation in addition to the mean field correlation, which are described by the hybrid-TV model, are shown to play a very important role in the binding of the Borromean three-body systems such as 4 He+n+n and 9 Li+n+n. Comparison between observed binding energies and theoretical ones calculated with a large model space and reliable core-n interactions are discussed. Excited three-body resonance states including the ground state of 10 He are also discussed by solving them with the complex scaling method.
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