Systematic investigation of E1 strength for the isotopes from Z = 28 to 50

TL;DR

This paper systematically investigates the electric dipole (E1) strength in neutron-rich isotopes from Z=28 to Z=50 using a time-dependent mean-field approach, focusing on pygmy dipole resonance and E1 polarizability.

Contribution

It introduces a self-consistent time-dependent Hartree-Fock-Bogoliubov method to study E1 modes across multiple isotopes, emphasizing the neutron-skin and PDR relationship.

Findings

Neutron-skin thickness and PDR correlation varies with neutron number.

E1 polarizability correlates more stably with skin thickness.

The study provides insights into nuclear structure in neutron-rich isotopes.

Abstract

We carry out a systematic study of electric dipole mode (E1) for neutron-rich isotopes from nickel (Z=28) to tin (Z=50) using a time-dependent mean-field theory. Our time-dependent scheme is the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory which can self-consistently describe nuclear dynamics with pairing correlation. We focus our discussion on the pygmy dipole resonance (PDR) and E1 polarizability. The correlation between neutron-skin thickness and PDR strongly depends on the neutron number, but the correlation between the skin thickness and E1 polarizability is much more stable.