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 ³H, ⁴He, and ¹⁰Be and proton scattering on ^3,4He, 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-¹⁰Be continuum is successful in explaining the parity-inverted ground state in ¹¹Be.