V. G. Gueorguiev

Light nuclei from chiral EFT interactions

Recent developments in nuclear theory allow us to make a connection between quantum chromodynamics (QCD) and low-energy nuclear physics. First, chiral effective field theory (χEFT) provides a natural hierarchy to define two-nucleon (NN), three-nucleon (NNN), and even four-nucleon interactions. Second, ab-initio methods have been developed capable to test these interactions for light nuclei. In this contribution, we discuss ab-initio no-core shell-model (NCSM) calculations for s-shell and p-shell nuclei with NN and NNN interactions derived within χEFT.

Surrogate nuclear reactions: an indirect method for determining reaction cross sections

An indirect method for determining cross sections of reactions proceeding through a compound nucleus is presented. Some applications of the Surrogate nuclear reaction approach are considered and challenges that need to be addressed are outlined.

Elements of the ab initio No Core Shell Model

We outline the ab initio no core shell model and present recent results. Nuclear properties are evaluated with two‐nucleon (NN) and three‐nucleon interactions (TNI) derived within effective field theory (EFT) based on chiral perturbation theory (ChPT). Fitting two available parameters of the TNI generates good descriptions of light nuclei. In another effort, referred to as the ab exitu approach, results are obtained with a realistic NN interaction derived by inverse scattering theory with off‐shell properties tuned to fit light nuclei. Both approaches produce good results for observables sensitive to spin‐orbit properties. In a third approach, we supplement the derived realistic effective interaction with phenomenological NN interaction terms with the goal to describe spectra of fp‐shell nuclei in the limited basis spaces currently available.