Structures of Light Halo Nuclei

We propose here an extended framework for antisymmetrized molecular dynamics (AMD) to describe the halo structure involving core excitation. We have applied this model to He isotopes, B-8, and C-9. Binding energies and radii in He isotopes are reproduced well by the present model, and the wave functions describe the spatial extension of the density distribution. These results indicate that a reasonable description of the halo structure is achieved in this model. Furthermore, the halo structure involving core excitation is found in B-8 and C-9. The cluster structure in the core plays an important role in explaining the observed electric quadrupole and magnetic dipole moments in these nuclei.