Fission modes of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Fm</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>256</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Fm</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>258</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>in a microscopic app

Bonneau, L.

doi:10.1103/physrevc.74.014301

Cited by 50 publications

(50 citation statements)

References 46 publications

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“…Using relations (42) and (43), the collective mass tensor (36) can now be expressed in terms of the derivatives of the mean-field potentials with respect to the collective coordinates q i and BCS-like quasiparticle energies (11),…”

Section: Canonical Basismentioning

confidence: 99%

Quadrupole collective inertia in nuclear fission: Cranking approximation

et al. 2011

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Collective mass tensor derived from the cranking approximation to the adiabatic time-dependent Hartree-Fock-Bogoliubov (ATDHFB) approach is compared with that obtained in the Gaussian Overlap Approximation (GOA) to the generator coordinate method. Illustrative calculations are carried out for one-dimensional quadrupole fission pathways in 256 Fm. It is shown that the collective mass exhibits strong variations with the quadrupole collective coordinate. These variations are related to the changes in the intrinsic shell structure. The differences between collective inertia obtained in cranking and perturbative cranking approximations to ATDHFB, and within GOA, are discussed.

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Section: Canonical Basismentioning

confidence: 99%

Quadrupole collective inertia in nuclear fission: Cranking approximation

et al. 2011

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“…Refs. [30,31,35,36,[55][56][57][58] for some recent applications. Since the parameters of the pseudopotential were explicitly adjusted to fission barrier heights, it is believed to have good deformation properties; (ii) The UNEDF0 EDF is a recent parametrization of the Skyrme energy density that gives a very good agreement with nuclear masses [47] but was shown to have unrealistic deformation properties [48,59]: we use it only to study the impact of model parameters on fission observables; (iii) The UNEDF1 EDF was obtained by extending the optimization protocol of UNEDF0 to include selected data on fission isomers [48].…”

Section: B Skyrme Energy Functionalmentioning

confidence: 99%

Description of induced nuclear fission with Skyrme energy functionals: Static potential energy surfaces and fission fragment properties

et al. 2014

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Eighty years after its experimental discovery, a description of induced nuclear fission based solely on the interactions between neutrons and protons and quantum many-body methods still poses formidable challenges. The goal of this paper is to contribute to the development of a predictive microscopic framework for the accurate calculation of static properties of fission fragments for hot fission and thermal or slow neutrons. To this end, we focus on the 239 Pu(n,f) reaction and employ nuclear density functional theory with Skyrme energy densities. Potential energy surfaces are computed at the Hartree-Fock-Bogoliubov approximation with up to five collective variables. We find that the triaxial degree of freedom plays an important role, both near the fission barrier and at scission. The impact of the parameterization of the Skyrme energy density and the role of pairing correlations on deformation properties from the ground-state up to scission are also quantified. We introduce a general template for the quantitative description of fission fragment properties. It is based on the careful analysis of scission configurations, using both advanced topological methods and recently proposed quantum many-body techniques. We conclude that an accurate prediction of fission fragment properties at low incident neutron energies, although technologically demanding, should be within the reach of current nuclear density functional theory.

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“…It is interesting to observe rather sudden changes from asymmetric to symmetric fission as reflected by the mass distributions which change from asymmetric to symmetric form when the neutron number increases toward N ≈ 160 for the elements Fm (Z = 100), No (Z = 102) and Rf (Z = 104). Some theoretical approaches to understand characteristic features of SF of heavy actinides have been extensively pursued in [55][56][57][64][65][66].…”

Section: Mass Distributionsmentioning

confidence: 99%

Two-mode fission – experimental verification and characterization of two fission-modes

Nagame

Nakahara

2012

Radiochimica Acta

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Summary.Experimental verification and characterization of the two-mode fission are reviewed. The presence of two independent deformation-paths in low energy fission of actinides is demonstrated by studying correlation among saddle-point configurations, scission-point configurations, and mass-yield distributions; the elongated scission configuration is related with the fission process that goes over a higher threshold energy and results in a symmetric mass-division mode, while the compact scission configuration with the process that experiences a lower threshold ends up with an asymmetric mass-division mode. Based on an extensive systematic analysis of scission properties in a wide range of actinide fission, the bimodal fission observed in the spontaneous fission of the heavy actinides is interpreted as the result of the presence of two fission paths, namely, the ordinary asymmetric fission path and a strongly shell-influenced symmetric mode.

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Fission modes ofFm256andFm258in a microscopic app

Cited by 50 publications

References 46 publications

Quadrupole collective inertia in nuclear fission: Cranking approximation

Quadrupole collective inertia in nuclear fission: Cranking approximation

Description of induced nuclear fission with Skyrme energy functionals: Static potential energy surfaces and fission fragment properties

Two-mode fission – experimental verification and characterization of two fission-modes

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