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Rubchenya, V. A.; Кузнецов, А. В.; Trzaska, W. H.; Вахтин, Д. Н.; Alexandrov, A. A.; Alkhazov, I. D.; Äystö, J.; Khlebnikov, S. V.; Lyapin, V. G.; Osetrov, O. I.; Penionzhkevich, Yu. É.; Pyatkov, Yu. V.; Tiourin, G. P.

doi:10.1103/physrevc.58.1587

Cited by 44 publications

(23 citation statements)

References 19 publications

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“…in an evaporation code [19,20,21,22,23,24]. In section 3 we will point out that such a treatment is exactly equivalent to solving the above-mentioned equation of motion with allowance for evaporation under the condition that the used time-dependent width ) (t f Γ is obtained by the Fokker-Planck or Langevin solution at each evaporation step.…”

Section: Introductionmentioning

confidence: 99%

A critical analysis of the modelling of dissipation in fission

et al. 2005

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Abstract:The time-dependent flux over the fission barrier of an excited nucleus under the influence of dissipation is investigated. Characteristic features of the evolution of the amplitude of the probability distribution and the velocity profile at the fission barrier are derived. Analytical results are compared to numerical Langevin calculations and used to develop a new analytical approximation to the solution of the Fokker-Planck equation for the time-dependent fission-decay width. This approximation is shown to be more realistic than previously proposed descriptions, which were widely used in the past..

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Section: Introductionmentioning

confidence: 99%

A critical analysis of the modelling of dissipation in fission

et al. 2005

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“…The time-dependent statistical approach was applied for description of particle emission during the fission process up to scission point to take into consideration fission the delay time and finite descent time from saddle to scission [7]. After pre-scission particle emission, the compound nucleus arrives at the scission point with some distributions of excitation energy , mass , charge , and spin .…”

Section: Formation Of the Compound Nuclei Ansemble At The Scission Pointmentioning

confidence: 99%

“…This model is a combination of new version of the two-component exciton model [6] and a time-dependent statistical model for fusion-fission process with inclusion of dynamical effects [7] for accurate calculations of nucleon composition and excitation energy of the fissioning nucleus at the scission point. The model for calculation of fission product yields proposed earlier [8] was upgraded by including a dynamical approach for isobaric width and calculating the parameters of charge polarization at scission point.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental studies of the neutron rich fission product yields at intermediate energies

Rubchenya

Gorelov

Penttilä

et al. 2012

EPJ Web of Conferences

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Abstract.A new method to measure the fission product independent yields employing the ion guide technique and a Penning trap as a precision mass filter, which allows an unambiguous identification of the nuclides is presented. The method was used to determine the independent yields in the proton-induced fission of 232 Th and 238 U at 25 MeV. The data were analyzed with the consistent model for description of the fission product formation cross section at the projectile energies up to 100 MeV. Pre-compound nucleon emission is described with the two-component exciton model using Monte Carlo method. Decay of excited compound nuclei is treated within time-dependent statistical model with inclusion of the nuclear friction effect. The charge distribution of the primary fragment isobaric chain was considered as a result of frozen quantal fluctuations of the isovector nuclear density. The theoretical predictions of the independent fission product cross sections are used for normalization of the measured fission product isotopic distributions.

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“…A large variety of studies [1][2][3][4][5][6][7][8][9][10] on the fission decay of composite systems with A≈180-250 has shown that the pre-scission multiplicities of neutrons and charged particles increase monotonically with the bombarding energy in contrast with the calculations of the statistical model (SM). This finding is considered as the evidence that fission is a slow process with respect to the lifetime for the emission of light particles.…”

Section: Introductionmentioning

confidence: 99%

“…However, several variants of the SM have been proposed in the literature to take explicitly into account transient effects, time scales as well as viscosity [1,2,6,7]. Following the initial idea of the "neutron clock" [1], the common trend is to split the path from the equilibrium to the scission point configuration into two regions, the pre-and the post-saddle.…”

Section: Introductionmentioning

confidence: 99%

Fission Dynamics: The Quest of a Temperature Dependent Nuclear Viscosity

Vardaci

Nitto

Nadtochy

et al. 2013

JNP

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Abstract. This contribution presents a journey within the open questions about the current use of a temperature dependent nuclear viscosity in models of nuclear fission and proposes an alternative experimental approach by using systems of intermediate fissility. This study is particularly relevant because: i) systems of intermediate fissility offer a suitable framework since the intervals between the compound nucleus and scission point temperatures with increasing excitation energy are much smaller than in the case of heavier systems, ii) the measurement of observables in the ER channel translates into a larger set of effective constraints for the models.

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Fission time scale and viscosity for compound nucleus220Thformed in reaction40
V. A. Rubchenya
¹
,
А. В. Кузнецов
²
,
W. H. Trzaska
³

et al.

Cited by 44 publications

References 19 publications

A critical analysis of the modelling of dissipation in fission

A critical analysis of the modelling of dissipation in fission

Theoretical and experimental studies of the neutron rich fission product yields at intermediate energies

Fission Dynamics: The Quest of a Temperature Dependent Nuclear Viscosity

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Fission time scale and viscosity for compound nucleus220Thformed in reaction40V. A. Rubchenya1, А. В. Кузнецов2, W. H. Trzaska3 et al.

Cited by 44 publications

References 19 publications

A critical analysis of the modelling of dissipation in fission

A critical analysis of the modelling of dissipation in fission

Theoretical and experimental studies of the neutron rich fission product yields at intermediate energies

Fission Dynamics: The Quest of a Temperature Dependent Nuclear Viscosity

Contact Info

Product

Resources

About

Fission time scale and viscosity for compound nucleus220Thformed in reaction40
V. A. Rubchenya
¹
,
А. В. Кузнецов
²
,
W. H. Trzaska
³

et al.