Theoretical investigations of isoscalar, isovector and mixed symmetry states in skin nuclei

TL;DR

This paper explores dipole and quadrupole excitations in spherical skin nuclei using density functional theory and quasiparticle phonon model, revealing a new pygmy quadrupole resonance mode linked to neutron skin thickness.

Contribution

It introduces a theoretical framework combining density functional theory and QPM to study skin nuclei and proposes a new pygmy quadrupole resonance mode in tin isotopes.

Findings

Identification of dipole and quadrupole excitations related to neutron skin

Proposal of a new pygmy quadrupole resonance mode in tin isotopes

Connection between excitation modes and neutron skin thickness

Abstract

We present recent investigations on dipole and quadrupole excitations in spherical skin nuclei, particular exploring their connection to the thickness of the neutron skin. Our theoretical method relies on density functional theory, which provides us with a proper link between nuclear many-body theory of the nuclear ground state and its phenomenological description. For the calculation of the nuclear excited states we apply QPM theory. A new quadrupole mode related to pygmy quadrupole resonance (PQR) in tin isotopes is suggested.