Systematic study of shell gaps in nuclei

Abstract

The nucleon separation energies and shell gaps in nuclei over the whole nuclear chart are systematically studied with eight global nuclear mass models. For unmeasured neutron-rich and super-heavy regions, the uncertainty of the predictions from these different mass models is still large. The latest version (WS4) of the Weizsäcker-Skyrme mass formula, in which the isospin dependence of model parameters is introduced into the macroscopic-microscopic approach inspired by the Skyrme energy-density functional, is found to be the most accurate one in the descriptions of nuclear masses, separation energies and shell gaps. Based on the predicted shell gaps in nuclei, the possible magic numbers in super-heavy nuclei region are investigated. In addition to the shell closures at $N=184,Z=114$, the sub-shell closures at around $N=178,Z=120$ could also play a role for the stability of super-heavy nuclei.

9 figures, to appear in Physical Review C

References in corpus (6)

• New parametrization for the nuclear covariant energy density functional with point-coupling interaction
• Surface diffuseness correction in global mass formula
• Progress on tilted axis cranking covariant density functional theory for nuclear magnetic and antimagnetic rotation
• Further improvements on a global nuclear mass model
• Mirror nuclei constraint in mass formula
• Reexamining the temperature and neutron density conditions for r-process nucleosynthesis with augmented nuclear mass models