Nuclear chart in covariant density functional theory with dynamical correlations: From Oxygen to Tin

TL;DR

This study improves nuclear mass predictions for O to Sn isotopes by incorporating dynamical correlations into covariant density functional theory, reducing deviations from experimental data and providing more accurate drip line positions.

Contribution

It introduces a method to include dynamical correlation energies in covariant density functional theory, enhancing nuclear mass predictions from oxygen to tin isotopes.

Findings

Root-mean-square deviation reduced from 2.50 MeV to 1.59 MeV.

DCEs have minimal impact on drip line positions.

Predicted bound nuclei count is 569 with DCEs and 564 without.

Abstract

Nuclear masses of even-even nuclei with the proton number $8\leq Z\leq 50$ (O to Sn isotopes) from proton drip line to neutron drip line are investigated using the triaxial relativistic Hartree-Bogoliubov (RHB) theory with the relativistic density functional PC-PK1, and the dynamical correlation energies (DCEs) associated with the rotational motion and the quadrupole shape vibrational motion are taken into account by the five-dimensional collective Hamiltonian (5DCH) method. The root-mean-square deviation with respect to the experimental masses reduces from 2.50 MeV to 1.59 MeV after the consideration of DCEs. The inclusion of DCEs has little influence on the position of drip lines, and the predicted numbers of bound even-even nuclei between proton and neutron drip lines from O to Sn isotopes are respectively 569 and 564 for the cases with and without DCEs.