Ab initio many-body calculations of nucleon-nucleus scattering

We develop a new ab initio many-body approach capable of describing simultaneously both bound and scattering states in light nuclei, by combining the resonating-group method with the use of realistic interactions, and a microscopic and consistent description of the nucleon clusters. This approach preserves translational symmetry and the Pauli principle. We outline technical details and present phase-shift results for neutron scattering on ³H, ⁴He, and ¹⁰Be and proton scattering on ^3,4He, using realistic nucleon-nucleon (NN) potentials. Our A=4 scattering results are compared to earlier ab initio calculations. We find that the CD-Bonn NN potential in particular provides an excellent description of nucleon-⁴HeS-wave phase shifts. In contrast, the experimental nucleon-⁴HeP-wave phase shifts are not well reproduced by any NN potential we use. We demonstrate that a proper treatment of the coupling to the n-¹⁰Be continuum is successful in explaining the parity-inverted ground state in ¹¹Be.