Ground state properties and potential energy surfaces of 270Hs from multidimensionally-constrained relativistic mean field model

Abstract

We study the ground state properties, potential energy curves and potential energy surfaces of the superheavy nucleus 270 Hs by using the multidimensionally-constrained relativistic mean-field model with the effective interaction PC-PK1. The binding energy, size and shape as well as single particle shell structure corresponding to the ground state of this nucleus are obtained. 270 Hs is well deformed and exhibits deformed doubly magic feature in the single neutron and proton level schemes. One-dimensional potential energy curves and two-dimensional potential energy surfaces are calculated for 270 Hs with various spatial symmetries imposed. We investigate in detail the effects of the reflection asymmetric and triaxial distortions on the fission barrier and fission path of 270 Hs. When the axial symmetry is imposed, the reflection symmetric and reflection asymmetric fission barriers both show a double-hump structure and the former is higher. However, when triaxial shapes are allowed the reflection symmetric barrier is lowered very much and then the reflection symmetric fission path becomes favorable. MDC-RMF model, superheavy nuclei, potential energy surface, fission barrier, reflection asymmetry, triaxial deformation PACS number(s): 21.10.-k, 21.60.Jz, 27.90.+b, 23.70.+j Citation: Meng X, Lu B N and Zhou S G, Ground state properties and potential energy surfaces of 270 Hs from multidimensionally-constrained relativistic mean field model, Sci.

Self-consistent methods for structure and production of heavy and superheavy nuclei

“…Taken from Ref. [412] static fission path, though it is higher in energy than the TA-RA cur in Fig. 73.…”

“…The shaded bands represent the results based on the experimental GT + data [392,393] where β λμ are deformation parameters. Besides β 20 corresponding to the elongation of the whole nucleus along its symmetry axis, other shape degrees of freedom also play a crucial role during the fission process [394][395][396][397][398][399][400][401][402][403][404][405][406][407][408][409][410][411][412]. Therefore, examining the multidimensional potential energy surfaces (PES) for a nucleus in question is important for obtaining detailed information about the fission properties.…”

“…[88,413] for two recent reviews and to Refs. [410][411][412][414][415][416][417][418][419][420][421][422][423][424][425][426][427][428][429][430] for more recent progress. The multidimensionally-constrained (MDC) CEDF models have been developed to calculate and study PES for SHN and heavy nuclei [138,405,407,431].…”

“…This nucleus has been investigated within the EDF models with the axial and/or reflection-symmetric shapes assumed [441][442][443][444][445][446][447][448]. Recently the MDC-RMF model has been used to make a thorough study of the ground-state properties, PES and fission barriers in 270 Hs [412]. The first PES has been presented for 270 Hs with both triaxiality and reflection asymmetry considered.…”

“…We may switch off TA or RA deformations and keep the nucleus in question axially symmetric (AS) or reflection symmetric (RS). Thus, four typical combinations of symmetries can be imposed in the MDC-RMF calculations: AS-RS, AS-RA, TA-RS and TA-RA [412].…”