Probing the structural evolution along the fission path in the superheavy nucleus ${}^{256}$Sg

Abstract

The evolution of structure property along the fission path in the superheavy nucleus ${}^{256}$Sg is predicted through the multi-dimensional potential-energy(or Routhian)-surface calculations,in which the phenomenological deformed Woods-Saxon potential is adopted. Calculated nuclear deformations and fission barriers for ${}_{106}^{256}$Sg${}_{150}$ and its neighbors, e.g., ${}^{258,260}$Sg, ${}^{254}$Rf and ${}^{252}$No are presented and compared with other theoretical results. A series of energy maps and curves are provided and used to evaluate the corresponding shape-instability properties, especially in the directions of triaxial $\gamma$ and different hexadecapole deformations (e.g., ${\alpha }_{40}$, ${\alpha }_{42}$ and ${\alpha }_{44}$). It is found that the triaxial deformation may help the nucleus bypass the first fission-barrier of the axial case. After the first minimum in the nuclear energy surface, the fission pathway of the nucleus can be affected by $\gamma$ and hexadecapole deformation degrees of freedom. In addition, microscopic single-particle structure, pairing and Coriolis effects are briefly investigated and discussed.

Comments: 26 pages, 10 figures