Binding Mechanism of a Neutron-Rich Nucleus 6He and Its Excited States

Abstract

By using the hybrid-TV model of the 4 He + n + n three-body system, the binding energy and excited states of "He are investigated.The binding energy 0.784 MeV is obtained for more realistic 4 He-n interaction.It is discussed that the n-n correlations, which are fully taken into account in the ECM bases, are very important to reproduce the binding energy of "He.The excited resonance states of the "He system are also calculated by applying the complex scaling method.The first excited z+ state obtained as a three-body resonance state is in good agreement with experiments.However, the excited 1-resonance states corresponding to the soft dipole excitation are not obtained at the low energy region.