Giant neutron halo in nuclei beyond beta-stability line

TL;DR

This paper investigates the development of giant neutron halos in nuclei beyond the beta-stability line, revealing that neutron skins grow due to neutron coats, leading to significant neutron halos and oscillations in charge radii.

Contribution

It introduces the concept of neutron coats causing giant neutron halos and analyzes their relation to shell oscillations and chemical potential shifts in unstable nuclei.

Findings

Neutron skin growth does not saturate due to neutron coats.

Presence of strong shell oscillations in charge radius.

Giant neutron halos develop as nuclei move away from stability.

Abstract

The radii of nucleon distribution and neutron skin in nuclei beyond the \beta-stability line are studied within the extended Thomas-Fermi approximation. We show that the growth of neutron skin in unstable nuclei does not obey the saturation condition because of the neutron coat. The neutron coat indicates the possibility of giant neutron halo which is growing with moving away from the beta stability line. We demonstrate the presence of strong shell oscillations in the charge radius R_C and the relation of R_C to the isospin shift of neutron-proton chemical potentials \Delta\lambda =\lambda_n-\lambda_p for nuclei beyond the beta-stability line at fixed value of mass number A.