ITP OpenIR  > SCI期刊论文
Zhao, J; Lu, BN; Niksic, T; Vretenar, D; Zhou, SG; Zhao, J (reprint author), Univ Zagreb, Dept Phys, Fac Sci, Bijenicka Cesta 32, Zagreb 10000, Croatia.
Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom
Source PublicationPHYSICAL REVIEW C
Language英语
Abstract

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.

2016
Volume93Issue:4Pages:44315
Cooperation Status国际
Subject AreaPhysics
DOIhttp://dx.doi.org/10.1103/PhysRevC.93.044315
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21240
CollectionSCI期刊论文
计算平台成果
Corresponding AuthorZhao, J (reprint author), Univ Zagreb, Dept Phys, Fac Sci, Bijenicka Cesta 32, Zagreb 10000, Croatia.
Recommended Citation
GB/T 7714
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.
APA Zhao, J,Lu, BN,Niksic, T,Vretenar, D,Zhou, SG,&Zhao, J .(2016).Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom.PHYSICAL REVIEW C,93(4),44315.
MLA Zhao, J,et al."Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom".PHYSICAL REVIEW C 93.4(2016):44315.
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