Giant Dipole Resonance and Related Spin-dependent Excitations

TL;DR

This paper investigates spin-dependent excitations in deformed nuclei using a time-dependent Hartree-Fock approach with Wigner Function Moments, revealing new insights into the electric Spin Dipole Resonance and its relation to the Giant Dipole Resonance.

Contribution

It introduces a method to include spin degrees of freedom in the Wigner Function Moments approach for nuclear excitations, providing detailed analysis of spin-dependent resonances in deformed nuclei.

Findings

Identification of electric Spin Dipole Resonance properties

Analysis of deformation-induced splitting of M2 resonance

Comparison with experimental data and other models

Abstract

The time-dependent Hartree-Fock equation is solved by the Wigner Function Moments method taking into account spin degrees of freedom. Energies and reduced transition probabilities of $K^\pi=0^-$, $1^-$ and $2^-$ excitations are calculated taking $^{164}$Dy as an example. The spin degrees of freedom give rise to the electric Spin Dipole Resonance. Its properties and interplay with the Giant Dipole Resonance are investigated. The deformation-induced splitting of the spin $M2$ resonance is discussed. The results of calculations are compared with the experimental data and other theoretical studies.