Time-dependent density-functional studies on strength functions in neutron-rich nuclei

TL;DR

This study uses time-dependent density functional theory to analyze electric dipole strength functions in neutron-rich nuclei, revealing how shell and deformation effects influence low-energy behaviors.

Contribution

It introduces a systematic TDDFT-based approach with the finite amplitude method to study E1 strength functions in neutron-rich isotopes, highlighting new effects related to neutron number variations.

Findings

Low-energy E1 strengths exhibit sudden enhancement and reduction.

Shell effects and deformation interplay influence strength behaviors.

Method demonstrates effectiveness in studying nuclear excitations.

Abstract

The electric dipole (E1) strength functions have been systematically calculated based on the time-dependent density functional theory (TDDFT), using the finite amplitude method and the real-time approach to the TDDFT with pairing correlations. The low-energy E1 strengths in neutron-rich isotopes show peculiar behaviors, such as sudden enhancement and reduction, as functions of the neutron numbers.They seem to be due to the interplay between the neutron shell effect and the deformation effect.