Nuclear scission and fission-fragment kinetic-energy distribution: Study within three-dimensional Langevin dynamics

Борунов, М. В.; Nadtochy, P. N.; Адеев, Г. Д.

doi:10.1016/j.nuclphysa.2007.11.002

Cited by 43 publications

(25 citation statements)

References 61 publications

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“…This deficiency of the model is well-known, and was attributed to the limited dimensionality of the shape parameterization [22], what can be cured in future developments.…”

Section: Resultsmentioning

confidence: 99%

On current ambiguity in the interpretation of fission at intermediate excitation energy

2014

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Various approaches are currently used to interpret experimental data on fission. We critically examine a wide set of observables measured for fission $^{206,210}$Po nuclei at medium excitation energy, and illustrate the ambiguity in current analysis. Dynamical calculations based on the four-dimensional Langevin equation using a macroscopic potential energy landscape are performed, and found to consistently describe available measurements. This observation calls into question the robustness of recent analysis based on statistical-model calculations and concluding, on the contrary, to substantial shell effects at the fission saddle point $^{206-210}$Po. The inconsistency in interpretation reached by the two approaches shows that, depending on the system, the conclusion can be strongly model-dependent. Although this may not be surprising, it emphasizes the today still limited reliability of firmly extracting fundamental nuclear properties from customary analysis

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“…This deficiency of the model is well-known, and was attributed to the limited dimensionality of the shape parameterization [22], what can be cured in future developments.…”

Section: Resultsmentioning

confidence: 99%

On current ambiguity in the interpretation of fission at intermediate excitation energy

2014

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“…The underestimation of σ 2 E K in dynamical calculations is apparently due to a poor ensemble of scission configurations generated by the {c, h, α} parametrization [86,87] that does not contain the nuclear shapes with elongated and thick neck, as parametrizations used in Refs [88][89][90].…”

Section: Cross Sections Parameters Of the Fission Fragment Med And mentioning

confidence: 99%

Four-dimensional Langevin dynamics of heavy-ion-induced fission

et al. 2012

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A four-dimensional dynamical model based on Langevin equations was developed and applied to calculate a wide set of experimental observables for the reactions 16 O + 208 Pb → 224 Th and 16 O + 232 Th → 248 Cf over a wide range of excitation energy. The fusion-fission and evaporation residue cross sections, fission fragment mass-energy distribution parameters, prescission neutron multiplicities, and anisotropy of angular distribution of fission fragments could be reasonably reproduced using a modified one-body mechanism for nuclear friction with a reduction coefficient of the contribution from a wall formula k s 0.25 and a dissipation coefficient for the orientation degree of freedom (K coordinate) γ K 0.077 (MeV zs) −1/2 . Inclusion of the K coordinate into calculation of potential energy changes the stiffness of the nucleus with respect to mass asymmetry coordinate for the values of K = 0 and results in a shift of the Businaro-Gallone point towards larger Z 2 /A values. The experimental data on the fission fragment mass-energy distribution parameters together with mean prescission neutron multiplicity for heavy fissioning nuclei are reproduced through the four-dimensional Langevin calculations more accurately than through three-dimensional calculations.

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“…Other, semi-classical, approaches have been used to calculate fission-fragment properties. We note in particular the full Langevin calculations of the Omsk group [9,10,11], and more recently the Brownian-motion approach of Randrup et al [12,13]. We have preferred to adopt the microscopic approach for the present work because, although it is far more technically and conceptually challenging, this approach incorporates the tenets of quantum mechanics from the start, such as the non-locality of the nuclear wave function and exchange terms in the Hamiltonian of the system.…”

Section: Introductionmentioning

confidence: 99%

Fragment Yields Calculated in a Time-Dependent Microscopic Theory of Fission

Younes¹,

Gogny²

2012

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Pre-neutron fragment-yield distributions are calculated for the 235 U(n, f ) and 239 Pu(n, f ) reactions using a time-dependent fully microscopic approach. These yields are calculated as a function of incident neutron energy from thermal to 5 MeV. We show that our calculations are in good agreement with experimental results, and competitive in accuracy with more phenomenological approaches. Further improvements to future calculations of these yields are discussed.

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Nuclear scission and fission-fragment kinetic-energy distribution: Study within three-dimensional Langevin dynamics

Cited by 43 publications

References 61 publications

On current ambiguity in the interpretation of fission at intermediate excitation energy

On current ambiguity in the interpretation of fission at intermediate excitation energy

Four-dimensional Langevin dynamics of heavy-ion-induced fission

Fragment Yields Calculated in a Time-Dependent Microscopic Theory of Fission

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