Dynamical approach to calculating angular distributions of fission fragments

Drozdov, V. A.; Eremenko, D. O.; Platonov, S. Yu.; Fotina, O. V.; Yuminov, O. A.

doi:10.1134/1.1349439

Cited by 10 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that the earlier obtained estimates of τ K lie in a rather wide interval (5-8) × 10 −21 s [33,[41][42][43] to 60 × 10 −21 s [44]. We stress that the relaxation time τ K was determined in [33] within a one-dimensional Langevin model, while, in other studies, calculations were performed within statistical models. At the same time, it follows from [39] that there is a dependence of τ K on the velocity of nuclear rotation, i.e.…”

Section: Comparison With Experimental Datamentioning

confidence: 86%

“…The dynamical model of the calculation of the fission fragment angular distributions proposed in [32,33] was generalized here to the case of three-dimensional Langevin model. In the present model, the fission dynamics described within the Langevin approach by the three collective coordinates determining the shape of the compound nucleus (c, h, α ) [9][10][11][12] was joined with the stochastic dynamics of the tilting mode.…”

Section: Formalism Of Calculation Of Fission Fragment Angular Distrib...mentioning

confidence: 99%

See 1 more Smart Citation

Dynamical treatment of fission fragment angular distribution

Карпов

Hiryanov

Sagdeev

et al. 2006

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

A dynamical approach to the treatment of fission fragment angular distribution is developed. The approach is based on three-dimensional Langevin dynamics for shape collective coordinates joined with the Monte Carlo algorithm for the degree of freedom associated with the projection K of the total angular momentum of the fissioning system on the symmetry axis. The relaxation time of the tilting mode τ K is estimated. From fits to experimental data on the fission fragment angular distribution of heavy fissioning compound systems, the K equilibration time is deduced to be ∼4 × 10 −21 s for temperatures ∼1-2 MeV. A modified one-body mechanism of nuclear viscosity with the reduction coefficient of the contribution from the 'wall' formula k s = 0.25 has been used in calculations.

show abstract

Section: Comparison With Experimental Datamentioning

confidence: 86%

Section: Formalism Of Calculation Of Fission Fragment Angular Distrib...mentioning

confidence: 99%

Dynamical treatment of fission fragment angular distribution

Карпов

Hiryanov

Sagdeev

et al. 2006

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

show abstract

“…The one-dimensional Langevin equations was applied to explore the main features of angular distribution [66,67]. Recently Jia and Bao [30] published the results of the angular distribution calculations within two-dimensional Langevin dynamics.…”

Section: The Effect Of Model Dimension On the Angular Distributionmentioning

confidence: 99%

Application of a temperature-dependent liquid-drop model to dynamical Langevin calculations of fission-fragment distributions of excited nuclei

et al. 2008

View full text Add to dashboard Cite

A stochastic approach to fission dynamics based on three-dimensional Langevin equations was applied to calculation of the mass-energy and angular distributions of fission fragments. The dependence of the mass-energy distribution parameters on the angular momentum and the anisotropy of the fission-fragment angular distribution on excitation energy have been studied in a wide range of the fissility parameter. A temperature-dependent finite-range liquid-drop model was used in a consistent way to calculate the functional of the Helmholtz free energy and level-density parameter. The modified one-body mechanism of nuclear dissipation (the so-called surface-plus-window dissipation) was used to determine the dissipative forces in Langevin equations. The evaporation of light prescission particles was taken into account on the basis of a statistical model combined with Langevin dynamics. The calculated parameters of the mass-energy distribution and their angular dependencies are in good quantitative agreement with the available experimental data at the value of the reduction coefficient of the contribution from the wall formula equal to 0.25. Analysis of the anisotropy of the fission-fragment angular distribution performed with the saddle-point transition state model and scission-point transition state model indicates that it is necessary to take into account the dynamical aspects of the fission-fragment angular distribution formation.

show abstract

“…The one-dimensional Langevin equations was applied to explore the main features of angular distribution [204,205]. In 2007 Jia and Bao [206] have published the results of the angular distribution calculations within twodimensional Langevin dynamics.…”

Section: The Effect Of Model Dimension On the Angular Distributionmentioning

confidence: 99%

Fission fragment distributions within dynamical approach

et al. 2017

View full text Add to dashboard Cite

The review covers recent developments and achievements in the dynamical description of fission process at high excitation energy. It is shown that the dynamical approach based on multidimensional Langevin equations combined with the statistical description of nuclear decay by particles evaporation is capable of fairly well describing the formation of fission fragment mass-energy, charge, and angular distributions of fission fragments in coincidence with the pre-and post-scission particle emission. The final yields of fission and evaporation residues channels products could be obtained. The detailed description of fission dynamics allows studying different stages of fission process, indicating the most important ingredients governing fission process and studying in detail such fundamental nuclear properties as nuclear viscosity and fission timescale. The tasks and perspectives of multidimensional dynamical approach are also discussed.

show abstract

Dynamical approach to calculating angular distributions of fission fragments

Cited by 10 publications

References 26 publications

Dynamical treatment of fission fragment angular distribution

Dynamical treatment of fission fragment angular distribution

Application of a temperature-dependent liquid-drop model to dynamical Langevin calculations of fission-fragment distributions of excited nuclei

Fission fragment distributions within dynamical approach

Contact Info

Product

Resources

About