Pygmy dipole resonance in exotic nuclei

TL;DR

This paper investigates how the pygmy dipole resonance (PDR) strength varies with neutron excess in exotic nuclei, exploring its potential link to neutron skin thickness using advanced theoretical models.

Contribution

It introduces a combined HFB and multi-phonon QPM approach to analyze PDR evolution and neutron/proton transition densities in exotic nuclei.

Findings

PDR strength correlates with neutron excess in Sn isotopes and N=82 isotones.

Neutron and proton transition densities provide insights into PDR structure.

The method enhances understanding of neutron skin effects in exotic nuclei.

Abstract

The evolution of the PDR strength with the neutron excess is investigated in Sn isotopic and N=82 isotonic chains with regard to its possible connection with the neutron skin thickness. For this purpose a recently proposed method incorporating both HFB and multi-phonon QPM theory is applied. Analysis of the corresponding neutron and proton dipole transition densities is presented.