Role of shape dependence of dissipation on nuclear fission

Sadhukhan, Jhilam; Pal, Santanu

doi:10.1103/physrevc.81.031602

Cited by 31 publications

(12 citation statements)

References 36 publications

(5 reference statements)

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“…Thus, the excitation-energy dependence of β can partly arise due to a number of simplifying assumptions which are made to obtain the Kramers fission width. Shape-independent constant values are assumed for the dissipation coefficient and collective inertia of fission degrees of freedom, though these quantities are shape dependent and their values at the saddle point are relevant for dynamics of fission [51,52]. Since the position of the saddle point depends on nuclear spin and the spin distribution of a compound nucleus depends on beam energy, an energy dependence of β may be required to account for these effects.…”

Section: Discussionmentioning

confidence: 99%

Evaporation residue excitation function measurement for the16O+194Ptreaction

et al. 2011

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Evaporation residue cross sections for the reaction 16 O + 194 Pt were measured at beam energies in the range 75.4-103.1 MeV using the gas-filled separator Hybrid Recoil Mass Analyzer at the Inter University Accelerator Centre, New Delhi. The transmission efficiency of the separator was obtained using the calibration system 16 O + 184 W and a Monte Carlo simulation code. Measured evaporation residue cross sections were fitted with statistical model calculations using Kramers' formula. The present measurement provides further evidence for the onset of dissipative forces in fission in the mass ∼200 region.

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Section: Discussionmentioning

confidence: 99%

Evaporation residue excitation function measurement for the16O+194Ptreaction

et al. 2011

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“…We calculate n pre for the above mentioned reaction with a constant β = 3.5MeV/ . The justification for using a constant β is given in an earlier work [13]. In the upper panel of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Neutron evaporation is one of the dominant decay mode in case of heavy-ion induced reactions. It is often used as the most effective probe to investigate nuclear properties like nuclear temperature [1,2], level density [3,4], fission lifetime [5][6][7][8][9], nuclear dissipation [10][11][12][13][14][15][16], etc. Moreover, in the contest of nuclear power production, neutron multiplicity plays the pivotal role in the operation of nuclear reactors.…”

Section: Introductionmentioning

confidence: 99%

Role of dynamical deformation in pre-scission neutron multiplicity

et al. 2017

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The light-particle emission probability from an excited compound nucleus depends explicitly on the time-evolution of the system as the available internal excitation energy and, consequently, the particle decay widths depend on the instantaneous deformation of the nucleus. The Langevin dynamical model for fission is employed to extract this deformation dependence in pre-scission particle multiplicities by following the propagation of fissioning trajectories up to scission. The variation of particle decay widths with nuclear deformation is accounted more precisely in comparison to the existing calculations. The number of neutrons emitted from different configurations of the compound nucleus are calculated for a detailed analysis. The deformation dependence of particle emission widths is found to be relevant for highly fissile systems where the dynamics is primarily governed by the saddle to scission motion. This dynamical effect essentially predicts the nuclear shape evolution through evaporated light particles and, for a heavy compound system, simultaneous measurement of neutron multiplicities for fission and evaporation residue events can reveal its intricate nature. PACS numbers: 24.10. 25.70.Gh, 27.90.+b

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“…Some recent works have reported how to make an accurate determination for the presaddle dissipation strength by analyzing various observables, such as evaporation residue cross sections [17][18][19] and its spin distributions [20,21], fission probabilities [22,23], and the width of the fission-fragment charge distributions [24,25]. However, the magnitude of presaddle friction is still debated [26][27][28][29]. Relative to numerous work in presaddle dissipation, only very few studies were put on the postsaddle dissipation [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Significant role of deformation in probing postsaddle nuclear dissipation with light particle emission

2010

Phys. Rev. C

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Using a one-dimensional Langevin model, we study the effects of deformation on the multiplicities of postsaddle neutrons, protons, α particles, and giant dipole resonance (GDR) γ rays of a heavy fissioning system 240 Cf as probes of postsaddle nuclear dissipation (β). It is shown that postsaddle dissipation effects on these light particles have a significant deformation dependence. Furthermore, we find that the role of deformation depends on the type of the particle. It reduces the sensitive influence of β on protons, α particles, and GDR γ rays substantially, whereas it enhances the sensitivity of neutrons to β. The results suggest that to accurately extract the postsaddle friction strength by comparing measured prescission particle multiplicities of heavy nuclei with calculations based on statistical models or stochastic equations like Langevin equations, it is important to take into account the deformation effects. The influence of model dimensionality is discussed.

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Role of shape dependence of dissipation on nuclear fission

Cited by 31 publications

References 36 publications

Evaporation residue excitation function measurement for the16O+194Ptreaction

Evaporation residue excitation function measurement for the16O+194Ptreaction

Role of dynamical deformation in pre-scission neutron multiplicity

Significant role of deformation in probing postsaddle nuclear dissipation with light particle emission

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