Collective Multipole excitations of exotic nuclei in relativistic continuum random phase approximation

TL;DR

This paper investigates collective multipole excitations in exotic nuclei using a self-consistent relativistic continuum RPA, highlighting the impact of continuum treatment on excitation spectra and strength distribution fragmentation.

Contribution

It introduces a fully self-consistent relativistic continuum RPA method that accurately incorporates continuum effects in exotic nuclei.

Findings

Low-energy excitations are prominent in neutron- and proton-rich nuclei.

Excess neutrons or protons lower the centroid energy of excitations.

Exact continuum treatment affects the strength distribution and fragmentation.

Abstract

Journal of Combinatorial Theory, Series B, 98(1):173-225, 2008n exotic nuclei are studied in the framework of a fully self-consistent relativistic continuum random phase approximation (RCRPA). In this method the contribution of the continuum spectrum to nuclear excitations is treated exactly by the single particle Green's function. Different from the cases in stable nuclei, there are strong low-energy excitations in neutron-rich nuclei and proton-rich nuclei. The neutron or proton excess pushes the centroid of the strength function to lower energies and increases the fragmentation of the strength distribution. The effect of treating the contribution of continuum exactly are also discussed.