Spectroscopic features of low-energy excitations in skin nuclei

TL;DR

This paper investigates low-energy nuclear excitations, especially pygmy resonances, and their relation to neutron and proton skin thickness, revealing detailed structures in specific nuclei like 138Ba.

Contribution

It provides a theoretical analysis linking low-energy dipole and quadrupole excitations to nuclear skin properties, with detailed structural insights into 138Ba.

Findings

Connection between pygmy resonance strengths and skin thickness

Revealed fine structure of low-energy dipole strength in 138Ba

Identified relation between static and dynamic nuclear properties

Abstract

Systematic studies of dipole and other multipole excitations in stable and exotic nuclei are discussed theoretically. Exploring the relation of the strengths of low-energy dipole and quadrupole pygmy resonances to the thickness of the neutron (proton) skin a close connection between static and dynamic properties of the nucleus is observed. The fine structure of low-energy dipole strength in 138Ba nucleus is revealed from E1 and spin-flip M1 strengths distributions.