A Systematic Study Of Even-even Nuclei From Ne To Ca In Covariant Density Functional Theory With Triaxiality

The ground-state properties of even-even nuclei from Z=10to Z=20are systematicallystudied in covariant density functional theory with the point-coupling interaction PC-PK1. Wefind that38Si,46S, and48S exhibit considerable triaxial deformation. However, the static efectof triaxial deformation on binding energy is negligible for the nuclei of concerned. Moreover,we show that the rms deviation in binding energies for the41nuclei from Ne to Ar is reducedfrom2.22MeV to1.47MeV after considering nuclear rotation correct energy with thispart of zero-point energy and the evolution trend of N=20shell gap is better reproducedafter considering the dynamical correlation energies. Other nuclear statistic properties are alsoexamined, like mass radius and charge radius.