Ab Initio Many-Body Calculations of n-3H, n-4He, p-{3,4}He, and n-10Be Scattering

TL;DR

This paper introduces a new ab initio many-body method combining the resonating-group approach with realistic interactions to accurately describe both bound and scattering states in light nuclei, addressing key nuclear structure phenomena.

Contribution

The paper develops a novel ab initio framework that unifies bound and scattering state calculations in light nuclei while maintaining fundamental symmetries and principles.

Findings

Phase shifts for neutron scattering on 3H, 4He, 10Be and proton scattering on 3,4He are computed.

Comparison with previous ab initio calculations shows improved accuracy.

Proper coupling to the n-10Be continuum explains the parity inversion in 11Be.

Abstract

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 {3,4}He, 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 essential to explain the parity-inverted ground state in 11Be.