The halo structure of neutron-drip line nuclei: (neutron) cluster-core model

Nuclei at the neutron-drip line are studied. In particular, we analyse the binding energies with the effects of Coulomb repulsion, nuclear attraction due to proximity and rotational energy due to angular momentum. This includ es the study of the 'neutron-halo structure' of some 18 light neutron-rich nuclei. In terms of the neutron-cluster + core picture, the halo structures of these nuclei are identified which agree with the hypothesis of one/two neutron separation energies and are supported by available experimental inf ormation. All the studied nuclei possess 1n- or 2n-halo structure. It is fu rther shown that these nuclei prefer stable cores with not only the neutron number N = 2Z but also with 2Z +/- 2.