Nuclear halo structure and pseudo-spin symmetry

TL;DR

This paper investigates nuclear halo structures and pseudo-spin symmetry restoration using relativistic Hartree-Fock-Bogoliubov theory, revealing giant halos in Cerium isotopes and emphasizing the importance of Fock terms in symmetry restoration.

Contribution

It demonstrates the role of Fock terms, especially $ ho$-tensor couplings, in restoring pseudo-spin symmetry and stabilizing neutron halo structures in a relativistic framework.

Findings

Giant and ordinary halos found in Cerium isotopes near neutron drip line.

Fock terms significantly contribute to PSS restoration.

Restoration of PSS stabilizes neutron halo structures.

Abstract

Nuclear halo structure and restoration of relativistic symmetry are studied within the framework of the relativistic Hartree-Fock-Bogoliubov (RHFB) theory. Giant halos as well as ordinary ones are found in Cerium isotopes close to the neutron drip line. Bridged by T=0 {channel}, the restoration of pseudo-spin symmetry (PSS) plays an essential role in stabilizing the neutron halo structures. The Fock terms, especially the $\rho$-tensor couplings, not only play significant role in the PSS restoration but also present substantial contributions to the T=0 {channel}, from which is well demonstrated the necessity of Fock terms.