Beyond the Core+n+nModel Based on the Complex Scaling Method

Abstract

With a new framework beyond the simple core+n+n model, we study neutron halo nuclei, taking into account a dynamical coupling between configurations of the core cluster and valence neutrons. It is shown that such a dynamical coupling is very important in 1 0 Li and 1 1 Li though less important in 6 He. We apply the new core+neutrons model to 9 Li+n and 9 Li+n+n where the 9 Li core includes J ϖ = 0 + neutron pairing correlations. In this new model, we solve the coupled channel OCM equation, and discuss the energy degeneracy of sand p-wave neutron orbits in 1 0 Li and the halo structure in 1 1 Li. In those calculations, the complex scaling method is extensively used to solve two-body and three-body resonances together with bound states in the same framework. The complex scaling method is also applied to the three-body Coulomb breakup by means of the extended completeness relation. This method is applied to the breakup reactions of 6 He and 1 1 Li.