Ab Initio Optical Potentials for Elastic Scattering at Low Energies Using the Symmetry- Adpated No-Core Shell Model

Ab initio optical potentials for elastic scattering at low energy is of particular interest for experiments at rare isotope beam facilities. In this work we combine the ab initio symmetry-adapted no-core shell-model results [1,2] with the Green's function evaluation of the optical potential through a self-energy calculation [3,4]. Specifically, we show preliminary results for neutron elastic scattering off Helium-4 and Carbon-12 with projectile energies between 0.5 and 10 MeV. We also discuss the role of collectivity and present comparisons to earlier models. [1] T. Dytrych, K. D. Launey, J. P. Draayer, et al., Phys. Rev. Lett. 124, 042501 (2020) [2] K. D. Launey, A. Mercenne, and T. Dytrych, Annu. Rev. Nucl. Part. Sci. (2021) [3] J. Rotureau, P. Danielewicz, G. Hagen, F. M. Nunes, and T. Papenbrock, Phys. Rev. C 95, 024315 (2017) [4] A. Idini, C. Barbieri, and P. Navrátil, Phys, Rev. Lett. 123, 092501 (2019)