Microscopic study of higher-order deformation effects on the ground states of superheavy nuclei around ${}^{270}$Hs

Abstract

We study the effects of higher-order deformations ${\beta }_{\lambda }$ ($\lambda =4,6,8,$ and $10$) on the ground state properties of superheavy nuclei (SHN) near the doubly magic deformed nucleus ${}^{270}$Hs by using the multidimensionally-constrained (MDC) relativistic mean-field (RMF) model with five effective interactions PC-PK1, PK1, NL3${}^{\ast }$, DD-ME2, and PKDD. The doubly magic properties of ${}^{270}$Hs are featured by the large energy gaps at $N=162$ and $Z=108$ in the single-particle spectra. By investigating the binding energies and single-particle levels of ${}^{270}$Hs in multidimensional deformation space, we find that the deformation ${\beta }_6$ has the greatest impact on the binding energy among these higher-order deformations and influences the shell gaps considerably. Similar conclusions hold for other SHN near ${}^{270}$Hs. Our calculations demonstrate that the deformation ${\beta }_6$ must be considered when studying SHN by using MDC-RMF.

Comments: accepted for publication in Chin. Phys. C