Deuteron-induced nuclear reactions within a Faddeev framework using ab initio interactions

Deuteron-induced nuclear reactions are an essential tool for probing the structure of stable and rare isotopes as well as extracting quantities of astrophysical interest such as (n,γ) cross sections on unstable targets. The deuteron-nucleus system can be treated as a three-body system consisting of the neutron, proton, and the nucleus. While Faddeev techniques enable the exact description of the three-body dynamics, their application to deuteron-induced reactions on rare isotopes is complicated by the unavailability of nucleon scattering data needed to constrain the corresponding effective nucleon-target interactions. To study and quantify the uncertainties, the three-body model should to be grounded in the underlying many-body theory. To proceed, we adopt the no-core shell model (NCSM) coupled with the resonating group method (RGM) approach to compute effective nucleon-nucleus interactions and construct a three-body Hamiltonian from the pairwise interactions. We present momentum space Faddeev calculations of observables for ⁶Li ground state and deuteron-alpha scattering using the microscopic interactions derived from the NCSM/RGM. To gain further insight on the Faddeev description of deuteron-nucleus systems, we contrast our results with those obtained directly from the NCSM/RGM approach.