Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom

doi:http://dx.doi.org/10.1103/PhysRevC.93.044315

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	Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom
	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.
刊名	PHYSICAL REVIEW C
	2016
卷号	93 期号:4 页码:44315
DOI	http://dx.doi.org/10.1103/PhysRevC.93.044315
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.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/21690]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Zhao, J (reprint author), Univ Zagreb, Dept Phys, Fac Sci, Bijenicka Cesta 32, Zagreb 10000, Croatia.
推荐引用方式 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.