Isoscalar and isovector giant resonances in 44Ca, 54Fe, 64,68Zn and 56,58,60,68Ni

TL;DR

This study investigates the behavior of giant resonance energies in various nuclei using theoretical models and compares the results with experimental data, highlighting the sensitivity to nuclear matter properties.

Contribution

It applies a comprehensive Hartree-Fock RPA approach with multiple Skyrme interactions to analyze giant resonance energies and their correlation with nuclear matter properties.

Findings

Good agreement with experimental data for isovector giant dipole resonance energies.

Identified correlations between centroid energies and nuclear matter properties.

Demonstrated sensitivity of resonance energies to different Skyrme interactions.

Abstract

We have studied the uncharacteristic behavior of the measured values of the isoscalar and isovector centroid energies, ECEN, of giant resonances with multipolarity L=0-3 in 44Ca, 54Fe, 64,68Zn and 56,58,60,68Ni. For this purpose, we carried out calculations of ECEN within the spherical Hartree-Fock (HF)-based random phase approximation (RPA) theory with 33 different Skyrme-type effective nucleon-nucleon interactions. We have also determined the Pearson linear correlation coefficients between the calculated centroid energies and the various nuclear matter (NM) properties associated with each interaction and determined the sensitivity of ECEN to NM properties. We compared the calculated centroid energies of the giant resonances with experimental data and discuss the results. We note in particular, that we obtain good agreement between the calculated ECEN of isovector giant dipole resonance and the available experimental data.