Multidimensionally-constrained relativistic mean-field models and potential-energy surfaces of actinide nuclei

	Multidimensionally-constrained relativistic mean-field models and potential-energy surfaces of actinide nuclei
	Lu, BN; Zhao, J; Zhao, EG; Zhou, SG
刊名	PHYSICAL REVIEW C
	2014
卷号	89 期号:1 页码:14323
通讯作者	Lu, BN (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
合作状况	国内
英文摘要	Background: Many different shape degrees of freedom play crucial roles in determining the nuclear ground state and saddle point properties and the fission path. For the study of nuclear potential energy surfaces, it is desirable to have microscopic and self-consistent models in which all known important shape degrees of freedom are included. Purpose: By breaking both the axial and the spatial reflection symmetries simultaneously, we develop multidimensionally-constrained relativistic mean field (MDC-RMF) models. Methods: The nuclear shape is assumed to be invariant under the reversion of x and y axes, i.e., the intrinsic symmetry group is V-4 and all shape degrees of freedom beta(lambda mu) with even mu, such as beta(20), beta(22), beta(30), beta(32), beta(40), ..., are included self-consistently. The single-particle wave functions are expanded in an axially deformed harmonic oscillator (ADHO) basis. The RMF functional can be one of the following four forms: the meson exchange or point-coupling nucleon interactions combined with the nonlinear or density- dependent couplings. The pairing effects are taken into account with the BCS approach. Results: The one-, two, and three-dimensional potential energy surfaces of Pu-240 are illustrated for numerical checks and for the study of the effect of the triaxiality on the fission barriers. Potential energy curves of even-even actinide nuclei around the first and second fission barriers are studied systematically. Besides the first ones, the second fission barriers in these nuclei are also lowered considerably by the triaxial deformation. This lowering effect is independent of the effective interactions used in the RMF functionals. Further discussions are made about different predictions on the effect of the triaxiality between the macroscopic-microscopic and MDC-RMF models, possible discontinuities on PES's from self-consistent approaches, and the restoration of broken symmetries. Conclusions: MDC-RMF models give a reasonably good description of fission barriers of even-even actinide nuclei. It is important to include both the nonaxial and the reflection asymmetric shapes simultaneously for the study of potential energy surfaces and fission barriers of actinide nuclei and of those in unknown mass regions such as, e.g., superheavy nuclei.
学科主题	Physics
类目[WOS]	Physics, Nuclear
关键词[WOS]	GROUND-STATE PROPERTIES ; DENSITY-FUNCTIONAL THEORY ; HARTREE-BOGOLIUBOV THEORY ; FISSION-BARRIERS ; SUPERHEAVY NUCLEI ; SHELL-CORRECTION ; FINITE NUCLEI ; REFLECTION ASYMMETRY ; EXOTIC NUCLEI ; ATOMIC-NUCLEI
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/21258]
专题	计算平台成果
推荐引用方式 GB/T 7714	Lu, BN,Zhao, J,Zhao, EG,et al. Multidimensionally-constrained relativistic mean-field models and potential-energy surfaces of actinide nuclei[J]. PHYSICAL REVIEW C,2014,89(1):14323.
APA	Lu, BN,Zhao, J,Zhao, EG,&Zhou, SG.(2014).Multidimensionally-constrained relativistic mean-field models and potential-energy surfaces of actinide nuclei.PHYSICAL REVIEW C,89(1),14323.
MLA	Lu, BN,et al."Multidimensionally-constrained relativistic mean-field models and potential-energy surfaces of actinide nuclei".PHYSICAL REVIEW C 89.1(2014):14323.