Multi-dimensional potential energy surfaces and non-axial octupole correlations in actinide and transfermium nuclei from relativistic mean field models

36th Symposium on Nuclear Physics

Lu, Bing-Nan^1 ; Zhao, Jie^1 ; Zhao, En-Guang^1,2 ; Zhou, Shan-Gui^1,2

State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China^1

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China^2

关键词: Density dependent;    Fission barrier;    Meson exchange;    Multi dimensional;    Non linear;    Relativistic mean fields;    Triaxial deformation;    Triaxiality;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/492/1/012014/pdf
DOI  :  10.1088/1742-6596/492/1/012014

来源: IOP

【 摘 要 】

We have developed multi-dimensional constrained covariant density functional theories (MDC-CDFT) for finite nuclei in which the shape degrees of freedom βλμwith even μ, e.g., β20, β22, β30, β32, β40, etc., can be described simultaneously. The functional can be one of the following four forms: the meson exchange or point-coupling nucleon interactions combined with the non-linear or density-dependent couplings. For the pp channel, either the BCS approach or the Bogoliubov transformation is implemented. The MDC-CDFTs with the BCS approach for the pairing (in the following labelled as MDC-RMF models with RMF standing for «relativistic mean field») have been applied to investigate multi-dimensional potential energy surfaces and the non-axial octupole Y32-correlations in N = 150 isotones. In this contribution we present briefly the formalism of MDC-RMF models and some results from these models. The potential energy surfaces with and without triaxial deformations are compared and it is found that the triaxiality plays an important role upon the second fission barriers of actinide nuclei. In the study of Y32-correlations in N = 150 isotones, it is found that, for248Cf and260Fm, β32> 0.03 and the energy is lowered by the β32distortion by more than 300 keV; while for246Cm and252No, the pocket with respect to β32is quite shallow.