A systematic study of even-even nuclei from Ne to Ca in covariant density functional theory with triaxiality

Abstract

The ground-state properties of even-even nuclei from Z = 10 to Z = 20 are systematically studied in covariant density functional theory with the point-coupling interaction PC-PK1. The triaxiality effect on nuclear binding energy, including the mean-field part and rotational correction energy, is examined. We find that 38Si, 46S, and 48S exhibit considerable triaxial deformation. The results indicate that the static effect from the triaxial deformation degree of freedom on the mean-field part of the nuclear binding energy in the present nuclei is marginal; however, it has a significant effect on the rotational correction energy. Moreover, we show that the root-meansquare deviation in binding energies for the 41 nuclei from Ne to Ar is reduced from 2.22 MeV to 1.60 MeV and the evolution trend of the N = 20 shell gap is better reproduced after considering phenomenological collective correction.