# Ab initio no-core shell model study of $^{18-23}$O and $^{18-24}$F isotopes

## TL;DR

This study uses ab initio no-core shell model calculations with various interactions to analyze the low-lying energy spectra and binding energies of oxygen and fluorine isotopes, comparing results with experimental data.

## Contribution

It provides a comprehensive ab initio analysis of oxygen and fluorine isotopes using multiple interactions and larger model spaces than previous studies.

## Key findings

- Overbinding observed in neutron-rich oxygen isotopes' ground states.
- Results agree well with experimental data for low-lying spectra.
- Comparison of different interactions highlights their effects on energy predictions.

## Abstract

In the present work, we have done a comprehensive study of low-lying energy spectrum for oxygen and fluorine chains using $ab~initio$ no core shell model. We have used inside nonlocal outside Yukawa (INOY) potential, which is a two body interaction but also has the effect of three body forces by short range and nonlocal character. Also, we have performed calculations with N3LO and N2LOopt interactions and compared corresponding results with the experimental data and phenomenological USDB interaction. We have reached up to $N_{max}$=6 for $^{18-21}$O and $^{18-19}$F, $N_{max}$=4 for other oxygen and fluorine isotopes, respectively. We have also discussed the binding energy of oxygen and fluorine chains. Over binding in the ground state (g.s.) energy in neutron rich oxygen isotopes is observed in our largest model space calculations.