Ab initio many-body calculations of n-3H, n-4He, p-3,4He, and n-10Be 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 Pauli principle. We present phase shifts for neutron scattering on 3 H, 4 He, and Be-10 and proton scattering on He-3,He-4, using realistic nucleon-nucleon potentials. Our A = 4 scattering results are compared to earlier ab initio calculations. We demonstrate that a proper treatment of the coupling to the n-Be-10 continuum is successful in explaining the parity-inverted ground state in Be-11.