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

Ye, W.

doi:10.1103/physrevc.81.054609

Cited by 10 publications

(7 citation statements)

References 74 publications

(144 reference statements)

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“…5(a), the correlation between multiplicity of particles and excitation energy depends on the model calculation. The same correlations can be also found in the interpretation of the particle multiplicities obtained in fusion-fission reactions [1,12,23,27,29,30,42]. This fact could affect the conclusions obtained by Tishchenko et al [37] because they used a statistical model to obtain the fission probabilities as a function of the excitation energy, and then used this correlation to discard dissipative and transient time effects.…”

Section: Resultsmentioning

confidence: 65%

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Light charged particles emitted in fission reactions induced by protons onPb208

et al. 2016

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Light charged particles emitted in proton-induced fission reactions on 208 Pb have been measured at different kinetic energies: 370A, 500A, and 650A MeV. The experiment was performed by the SOFIA Collaboration at the GSI facilities in Darmstadt (Germany). The inverse kinematics technique was combined with a setup especially designed to measure light charged particles in coincidence with fission fragments. This measurement allowed us, for the first time, to obtain correlations between the light charged particles emitted during the fission process and the charge distributions of the fission fragments. These correlations were compared with different model calculations to assess the ground-to-saddle dynamics. The results confirm that transient and dissipative effects are required for an accurate description of the fission observables.

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Section: Resultsmentioning

confidence: 65%

“…However, the correlation between the excitation energy and the multiplicity of light particles could change with the model parameters, as demonstrated in Refs. [29,30,[40][41][42], affecting the conclusions.…”

Section: Introductionmentioning

confidence: 98%

Light charged particles emitted in fission reactions induced by protons onPb208

et al. 2016

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“…19 F, 28 Si + 197 Au, and the discrepancy possibly arises from the aforementioned processes. Moreover, dynamical deformation may cause the observed deviation of the predicted particle multiplicities from the measured ones [135,136].…”

Section: Discussionmentioning

confidence: 95%

Detailed statistical model analysis of observables from fusion-fission reactions

2019

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Background:Despite remarkable success of the statistical model (SM) in describing decay of excited compound nuclei (CN), reproduction of the observables from heavy ion-induced fusion-fission reactions is often quite challenging. Ambiguities in choosing the input parameters, lack of clarity about inclusion of various physical effects in the model, and contradictory requirements of input parameters while describing different observables from similar reactions are among the major difficulties of modeling decay of fissile CN. Purpose: This work attempts to overcome the existing inconsistencies by inclusion of important physical effects in the model and through a systematic analysis of a large set of data over a wide range of CN mass (A CN ). Method: The model includes the shell effect in the level density (LD) parameter, shell correction in the fission barrier (B f ), the effect of the orientation degree of freedom of the CN spin (K or ), collective enhancement of level density (CELD), and dissipation in fission. Input parameters are not tuned to reproduce observables from specific reaction(s) and the reduced dissipation coefficient (β) is treated as the only adjustable parameter. Calculated evaporation residue (ER) cross sections (σ ER ), fission cross sections (σ fiss ), and particle, i.e., neutron, proton, and α particle, multiplicities are compared with data covering A CN = 156-248. Results: The model produces reasonable fits to ER and fission excitation functions for all the reactions considered in this work. Pre-scission neutron multiplicities (ν pre ) are underestimated by the calculation beyond A CN ∼ 200. An increasingly higher value of β, in the range of 2-4 × 10 21 s −1 , is required to reproduce the data with increasing A CN . Proton and α-particle multiplicities, measured in coincidence with both ERs and fission fragments, are in qualitative agreement with model predictions. Conclusions:The present work mitigates the existing inconsistencies in modeling statistical decay of the fissile CN to a large extent. Contradictory requirements of fission enhancement-obtained by scaling down the fission barrier to reproduce σ ER or σ fiss and fission suppression realized by introducing dissipation in the fission channel to reproduce ν pre , for similar reactions-have now become redundant. There are scopes for further refinement of the model, as is evident from the mismatch between measured and calculated particle multiplicities in a few cases.

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“…Refs. [3,4,13,21,[23][24][25][26][27][28][29][30]). Our work stems from the nuclear fission problem too.…”

Section: Introductionmentioning

confidence: 99%

Thermal decay rate of a metastable state with two degrees of freedom: Dynamical modelling versus approximate analytical formula

Gontchar

Chushnyakova

2017

Pramana - J Phys

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Accuracy of the Kramers approximate formula for the thermal decay rate of the metastable state is studied for the twodimensional potential pocket. This is done by the comparison with the quasistationary rate resulting from the dynamical modeling. It is shown that the Kramers rate is in agreement with the quasistationary rate within the statistical errors provided the absorptive border is far enough from the potential ridge restricting the metastable state. As the absorptive border (or its part) gets closer to the ridge the Kramers formula underestimate the quasistationary rate. The difference reaches approximately the factor of 2 when the absorptive border coincides with the ridge. Metastable system; quasistationary decay rate; Kramers rate; dynamical modeling PACS numbers: 05.60.-k, 82.20.Pm

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

Cited by 10 publications

References 74 publications

Light charged particles emitted in fission reactions induced by protons onPb208

Light charged particles emitted in fission reactions induced by protons onPb208

Detailed statistical model analysis of observables from fusion-fission reactions

Thermal decay rate of a metastable state with two degrees of freedom: Dynamical modelling versus approximate analytical formula

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