Structure of Two-Neutron Halo in Light Exotic Nuclei

Structure of two-neutron halo in light exotic nuclei is studied by a three-body model using the neutron-neutron interaction fixed at the low-energy scattering limit. The model is applied to the dripline nucleus C-22 assuming a pure s-wave halo with correlated C-20-core, and a unique relation between two-neutron separation energy and halo radius is derived. It is also applied to F-29, where 2p(3/2)-orbit is shown to be important for forming the halo. The estimated halo radii in C-22 and F-29 are found to be consistent with the recent experimental data. The halos in B-17 and B-19 are analyzed by the three-body model with mixed configurations of 2s(1)(/2)(2) and 1d(5/)(2)(2). The dominance of the d-orbit is found in B-17, while the s-orbit component is found to be about 40% in B-19.

Automated summary

The structure of two-neutron halo in light exotic nuclei was studied using a three-body model, revealing the importance of different orbitals and configurations in forming the halo in various nuclei. The results show consistency with recent experimental data and provide valuable insights into the composition of halos in different isotopes.