Light Neutron-Rich Hypernuclei from the Importance-Truncated No-Core Shell Model

TL;DR

This study uses an advanced ab initio no-core shell model with importance truncation to systematically analyze ground and excited states of neutron-rich hypernuclei, providing predictions and insights into their stability and spectra.

Contribution

It applies the importance-truncated no-core shell model with chiral interactions to hypernuclei, offering new predictions for neutron-rich hypernuclear properties and stability.

Findings

Neutron separation energies are stable and match experimental data.

Neutron drip lines are unaffected by hyperon addition.

Predictions for unobserved hypernuclear spectra.

Abstract

We explore the systematics of ground-state and excitation energies in singly-strange hypernuclei throughout the helium and lithium isotopic chains --- from $^5_\Lambda$He to $^{11}_\Lambda$He and from $^7_\Lambda$Li to $^{12}_\Lambda$Li --- in the ab initio no-core shell model with importance truncation. All calculations are based on two- and three-baryon interaction from chiral effective field theory and we employ a similarity renormalization group transformation consistently up to the three-baryon level to improve the model-space convergence. While the absolute energies of hypernuclear states show a systematic variation with the regulator cutoff of the hyperon-nucleon interaction, the resulting neutron separation energies are very stable and in good agreement with available data for both nucleonic parents and their daughter hypernuclei. We provide predictions for the neutron separation energies and the spectra of neutron-rich hypernuclei that have not yet been observed experimentally. Furthermore, we find that the neutron drip lines in the helium and lithium isotopic chains are not changed by the addition of a hyperon.