Description of nuclei around N=20 starting from the Argonne V18 interaction

TL;DR

This paper investigates nuclei around N=20 using the Argonne V18 interaction with a no-core approach, providing insights into their structure but not fully capturing experimental collectivity.

Contribution

It applies the Lee-Suzuki renormalization and Hybrid Multi-Determinant method to study these nuclei with multiple shells, offering a novel computational approach.

Findings

Qualitative agreement with experimental energy levels

Calculated B(E2) values underestimate collectivity

Uses up to hundreds of Slater determinants

Abstract

Using the Argonne V18 interaction, renormalized with the Lee-Suzuki method, we study nuclei around the $N=20$ island of inversion. We include 5 major oscillator shells, in a no-core approach, using the Hybrid Multi-Determinant method reaching up to few hundreds Slater determinants. Although qualitatively in agreement with the experimental levels, the calculated BE2 do not show the same amount of collectivity seen experimentally.