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

TL;DR

This paper applies the In-Medium Similarity Renormalization Group method to study closed-shell nuclei using chiral two- and three-nucleon interactions, achieving good agreement with experimental data for light and oxygen isotopes.

Contribution

It demonstrates the effectiveness of IM-SRG with chiral interactions in accurately predicting nuclear binding energies across multiple isotopes.

Findings

Good agreement with experimental binding energies for He-4 and oxygen isotopes.

Overbinding observed in calcium and nickel isotopes.

IM-SRG results compare favorably with Coupled Cluster and No-Core Shell Model calculations.

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 $\nuc{Ni}{56}$, 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 $\nuc{He}{4}$ and the closed-shell oxygen isotopes, while the calcium and nickel isotopes are somewhat overbound.