In-Medium Similarity Renormalization Group with Chiral Two- Plus Three-Nucleon Interactions

Abstract

We use the recently proposed In-Medium Similarity Renormalization Group (IM-SRG) to carry out a systematic study of closed-shell nuclei up to $\text{nuc}Ni56$, based on chiral two- plus three-nucleon interactions. We analyze the capabilities of the IM-SRG by comparing our results for the ground-state energy to Coupled Cluster calculations, as well as to quasi-exact results from the Importance-Truncated No-Core Shell Model. Using chiral two- plus three-nucleon Hamiltonians whose resolution scales are lowered by free-space SRG evolution, we obtain good agreement with experimental binding energies in $\text{nuc}He4$ and the closed-shell oxygen isotopes, while the calcium and nickel isotopes are somewhat overbound.

Comments: 11 pages, 7 figures, submitted to Phys. Rev. C