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题名: Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom
作者: Zhao, J;  Lu, BN;  Niksic, T;  Vretenar, D;  Zhou, SG
刊名: PHYSICAL REVIEW C
出版日期: 2016
卷号: 93, 期号:4, 页码:44315
学科分类: Physics
DOI: http://dx.doi.org/10.1103/PhysRevC.93.044315
通讯作者: Zhao, J (reprint author), Univ Zagreb, Dept Phys, Fac Sci, Bijenicka Cesta 32, Zagreb 10000, Croatia.
文章类型: Article
合作性质: 国际
英文摘要: Background: Studies of fission dynamics, based on nuclear energy density functionals, have shown that the coupling between shape and pairing degrees of freedom has a pronounced effect on the nonperturbative collective inertia and, therefore, on dynamic (least-action) spontaneous fission paths and half-lives. Purpose: The aim is to analyze the effects of particle-number fluctuation degrees of freedom on symmetric and asymmetric spontaneous fission (SF) dynamics, and to compare the findings with the results of recent studies based on the self-consistent Hartree-Fock-Bogoliubov (HFB) method. Methods: Collective potentials and nonperturbative cranking collective inertia tensors are calculated using the multidimensionally-constrained relativistic-mean-field (MDC-RMF) model. Pairing correlations are treated in the BCS approximation using a separable pairing force of finite range. Pairing fluctuations are included as a collective variable using a constraint on particle-number dispersion. Fission paths are determined with the dynamic programming method by minimizing the action in multidimensional collective spaces. Results: The dynamics of spontaneous fission of Fm-264 and Fm-250 are explored. Fission paths, action integrals, and corresponding half-lives computed in the three-dimensional collective space of shape and pairing coordinates, using the relativistic functional DD-PC1 and a separable pairing force of finite range, are compared with results obtained without pairing fluctuations. Results for Fm-264 are also discussed in relation with those recently obtained using the HFB model. Conclusions: The inclusion of pairing correlations in the space of collective coordinates favors axially symmetric shapes along the dynamic path of the fissioning system, amplifies pairing as the path traverses the fission barriers, significantly reduces the action integral, and shortens the corresponding SF half-life.
类目[WOS]: Physics, Nuclear
关键词[WOS]: HARTREE-BOGOLIUBOV THEORY ;  NUCLEAR-STRUCTURE ;  MASS PARAMETERS ;  FINITE NUCLEI ;  DYNAMICS ;  MODE ;  DEFORMATION ;  PROBABILITY ;  VIBRATIONS ;  BARRIERS
收录类别: SCI
项目资助者: NEWFELPRO project of the Ministry of Science, Croatia ;  Marie Curie FP7-PEOPLE-COFUND program ;  Croatian Science Foundation-project "Structure and Dynamics of Exotic Femtosystems" [IP-2014-09-9159] ;  National Key Basic Research Program of China [2013CB834400] ;  National Natural Science Foundation of China [11120101005, 11275248, 11525524] ;  Knowledge Innovation Project of the Chinese Academy of Sciences [KJCX2-EW-N01]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21240
Appears in Collections:理论物理所计算集群成果_计算集群论文-标明致谢

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Recommended Citation:
Zhao, J,Lu, BN,Niksic, T,et al. Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom[J]. PHYSICAL REVIEW C,2016,93(4):44315.
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