A study of open shell nuclei using chiral two-body interactions

TL;DR

This paper investigates open shell nuclei using chiral two-body interactions with the Hybrid-Multi-Determinant method, focusing on nuclei up to A=48, and highlights discrepancies in excitation energies for certain isotopes.

Contribution

It applies the Hybrid-Multi-Determinant method with recent chiral interactions to nuclei up to A=48 without renormalization, exploring its effectiveness.

Findings

Excitation energies for ${}^{24}Mg$ and ${}^{48}Cr$ are significantly higher than experimental values.

The method successfully models nuclei up to A=48 using bare chiral interactions.

Discrepancies suggest the need for further refinement in the approach.

Abstract

We apply the Hybrid-Multi-Determinant method using the recent chiral two-body interactions of Entem-Machleidt-Nosyk (EMN) without renormalization to few nuclei up to A=48. Mostly we use the bare fifth order NN interaction N4LO-450. For ${}^{24}Mg$ and ${}^{48}Cr$ the excitation energies of the $2^+_1$ states are far larger than the corresponding experimental values.