Paring correlations in weakly bound nuclei on the edge of the neutron-drip line is studied by use of a three-body model. A density-dependent contact interaction is employed to calculate the ground state of halo nuclei He6 and Li11, as well as a skin nucleus O24. Dipole excitations in these nuclei are also studied within the same model. We point out that the dineutron-type correlation plays a dominant role in the halo nuclei He6 and Li11, having the coupled spin of the two neutrons S=0, whereas the correlation similar to the BCS type is important in O24. Contributions of the spin S=1 and S=0 configurations are separately discussed in the low-energy dipole excitations.
ASJC Scopus subject areas
- Nuclear and High Energy Physics