Determination of the time evolution of fission from particle emission

Lestone, J. P.

doi:10.1103/physrevlett.70.2245

Cited by 109 publications

(79 citation statements)

References 19 publications

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“…This work also pointed out that the reason why the statistical model fails to reproduce the experimental data for T threshold /B f > 0.26 is that at that point the dynamical delay time starts to be larger than the decay time predicted by the statistical model. Similar conclusions were also found by Lestone et al [6,7], who were able to describe evaporation and fission cross sections as well as light-charged particles multiplicities of fusion reactions considering a temperature independence of the dissipation parameter.…”

Section: Introductionsupporting

confidence: 73%

Dissipative effects in fission investigated with proton-on-lead reactions

Rodríguez-Sànchez

Benlliure

Taïeb

et al. 2016

EPJ Web of Conferences

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The complete kinematic measurement of the two fission fragments permitted us to investigate dissipative effects at large deformations, between the saddle-point and the corresponding scission configurations. Up to now, this kind of study has only been performed with fusionfission reactions using a limited number of observables, such as the mass distribution of the fission fragments or the neutron multiplicities. However, the large angular momenta gained by the compound nucleus

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Section: Introductionsupporting

confidence: 73%

Dissipative effects in fission investigated with proton-on-lead reactions

Rodríguez-Sànchez

Benlliure

Taïeb

et al. 2016

EPJ Web of Conferences

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“…A dissipation parameter determines how fast the fission coordinate reaches the saddle point, the so called transient time, and the saddle-toscission time. A time-dependent description of this dissipative process was provided by Grangé and Weidenmüller in the 80's by using transport calculations based on the Langevin equation [6] Those ideas were confirmed in the 90's by measuring multiplicities of neutrons [3], light-charged particles [4], and gamma rays [5] emitted until the scission point. It was found that those multiplicities were much larger than the ones predicted by the statistical model.…”

Section: Introductionmentioning

confidence: 87%

New experimental approaches to investigate the fission dynamics

Benlliure¹,

Rodríguez-Sànchez²,

Álvarez‐Pol³

et al. 2016

AIP Conference Proceedings

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Abstract. The first ever achieved full identification of both fission fragments, in atomic and mass number, made it possible to define new observables sensitive to the fission dynamics along the fission path up to the scission point. Moreover, proton-induced fission of 208 Pb at high energies offers optimal conditions for the investigation of dissipative, and transient effects, because of the high-excitation energy of the fissioning nuclei, its low angular momentum, and limited shape distortion by the reaction. In this work we show that the charge distribution of the final fission fragments can constrain the ground-to-saddle dynamics while the mass distribution is sensitive to the dynamics until the scission point.

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“…4 shows the contribution from various sources in the fitted spectra at various angles. The experimental value of α pre so obtained, was compared with the statistical model code JOANNE2 [9]. In order to reproduce the measured value of α pre , the effect of deformation on particle binding energy and transmission coefficients in fission process were incorporated [2].…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…On the basis of time scales, fission time is divided into two major parts: the transient time and saddle to scission time (Z ssc ). The study of both these times gives insight into fission dynamics and fission lifetimes [9]. It has been reported earlier that the fission process slows down to an order (10 -20 -10 -19 s) due to nuclear viscosity [10].…”

Section: Introductionmentioning

confidence: 99%

Study of nuclear fusion-fission dynamics in 16O+194Pt reaction

Kapoor

Verma

Sharma

et al. 2017

AIP Conference Proceedings

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Abstract. Pre-and post-scission α-particle multiplicities have been measured for the reaction 16 O + 194 Pt at 98.4 MeV forming compound nucleus 210 Rn. The α-particle's yield has been measured in coincidence with the fission fragments at various angles. The moving source analysis was performed to extract the alpha particle multiplicity which yielded the contribution of pre-and postscission components. The pre-scission α-particle multiplicity has been compared with JOANNE2 statistical model code predictions to extract fission time scale and which is observed to be around 55zs (1zs=10 -21 s).

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Determination of the time evolution of fission from particle emission

Cited by 109 publications

References 19 publications

Dissipative effects in fission investigated with proton-on-lead reactions

Dissipative effects in fission investigated with proton-on-lead reactions

New experimental approaches to investigate the fission dynamics

Study of nuclear fusion-fission dynamics in 16O+194Pt reaction

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