Converging Many-Body Perturbation Theory for Ab Initio Nuclear Structure: II. Brillouin-Wigner Perturbation Series for Open-Shell Nuclei

Zhen Li, Nadezda A. Smirnova

Brillouin-Wigner (BW) perturbation theory is developed for both ground and excited states of open-shell nuclei. We show that with optimal partitioning of the many-body Hamiltonian…