Insight into excitation energy and structure effects in fission from isotopic information in fission yields

Ramos, D.; Caamaño, M.; Farget, F.; Rodríguez–Tajes, C.; Audouin, L.; Benlliure, J.; Casarejos, E.; Clément, E.; Cortina, D.; Delaune, O.; Derkx, X.; Dijon, A.; Doré, D.; Fernández–Domínguez, B.; Heinz, A.; Jacquot, B.; Paradela, C.; Rejmund, M.; Roger, T.; Salsac, M. D.; Schmitt, C.

doi:10.1103/physrevc.99.024615

Cited by 22 publications

(8 citation statements)

References 51 publications

(108 reference statements)

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“…These modes only exist at low energies or during spontaneous fission events. However, 30 years later, it is shown that these modes can also occur at high energies events (≈20 MeV) [22]. It had even been experimentally proven by Balabekyan et al, [23] nine years earlier.…”

Section: Introduction 1*mentioning

confidence: 94%

Total Kinetic Energy of Fission Fragments based on Fission Product Data

Kurniadi

2023

ijp

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Total kinetic energy (TKE) is the physical quantity that must be acquired during a nuclear fission reaction. This energy is used for various purposes, primarily to determine the spectrum of the second proton. This spectrum is advantageous in the design of nuclear reactors. Various techniques for calculating TKE, from microscopic to macroscopic, have been carried out, from statistical to quantum reviews. This whole technique is solely for obtaining TKE accurately. This paper will review the TKE calculation based on the fission products' experimental results. This fission product data can be in the form of raw experimental data or evaluated data. The calculations are carried out within a macroscopic and statistical review framework. The macroscopic view is a liquid drop model, while the statistics use the random number technique. Because the liquid drop model and the random number technique are very standard, this paper does not review them.

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Section: Introduction 1*mentioning

confidence: 94%

Total Kinetic Energy of Fission Fragments based on Fission Product Data

Kurniadi

2023

ijp

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“…Now new detailed experimental studies of staggering in fission-fragment charge distributions have become available for several fissioning nuclei and excitation energies, see Ref. [12] and references therein. Therefore we are now in a position to compare calculated and experimental global and local staggering quantities and their variation with excitation energy, element and isotope.…”

Section: Nascent Fragment Pairing Effectsmentioning

confidence: 99%

Detailed modeling of odd–even staggering in fission-fragment charge distributions

Möller,

Schmitt

2024

Eur. Phys. J. A

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During the last 10 years or so the Brownian shape-motion (BSM) model has been used in numerous calculations of fission-fragment mass and charge distributions with encouraging agreement with experimental measurements. In this model the structure obtained in the fission-fragment distributions is entirely a consequence of the structures in the calculated five-dimensional (5D) potential-energy surfaces. The potential-energy model until recently did not accommodate the influence of the emerging fragment properties on the calculated potential energy. Therefore there were no odd-even effects in the calculated fission-fragment distributions. Recent extensions of the potential-energy model allow properties of the nascent fragments to be included in the potential-energy model. Application of the BSM model to execute random walks on these more detailed potential-energy surfaces led to calculated fission-fragment yields that exhibited odd-even effects, which “by eye” indicated reasonable agreement with experimental data. The present work goes a step further with a quantitative comparison between experimental and theoretical results based on the global and local odd-even staggering observables. Theoretical calculations and experimental observations both show that pairing effects and enhancement of two-nucleon relative to one-nucleon transfer in heavy-ion collisions decrease with excitation energy and implementing a damping of these quantities with excitation energy leads to improved agreement with experiment. Characteristic variations of the local staggering with charge split seen in the experimental data are also present in the calculated results.

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“…Ref. [7], with the heavy fragment being relatively neutron-rich and the lighter neutron-poor for fission of typical actinides, is reproduced. Though, the influence of shell effects in the vicinity of 132 Sn is weaker in theory as compared to the measurement.…”

Section: Post-scission Evaporationmentioning

confidence: 99%

“…Furthermore, unlike Ref. [16], we use an approximate formula [7] for the density of states of the deformed fragments, rather than the actual s.p. level densities with the shell effects.…”

Section: Post-scission Evaporationmentioning

confidence: 99%

“…These are not independent one from another: Stage (iii) critically depends on the properties (N , Z, excitation energy and angular momentum) of the (primary) fragments produced at scission at the end of stage (ii). While experimental information was restricted to fissionfragment mass distributions with limited resolution for several decades [3], recent developments give access to a widespread variety of observables, their correlations, and this with unprecedented resolution [4][5][6][7][8]. Such information is essential to unravel in an un-ambiguous way the intricacies of the fission process.…”

Section: Introductionmentioning

confidence: 99%

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Fourier-over-Spheroid shape parametrization applied to nuclear fission dynamics

Pomorski,

Nerlo-Pomorska,

Schmitt

et al. 2023

Preprint

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We propose a new, rapidly convergent, the so-called Fourier over Spheroid (FoS), shape parametrization to model fission of heavy nuclei. Four collective coordinates are used to characterize the shape of the fissioning system, being its elongation, left-right asymmetry, neck size, and non-axiality. The potential energy landscape is computed within the macroscopic-microscopic approach, on the top of which the multi-dimensional Langevin equation is solved to describe the dynamics. Charge equilibration at scission and de-excitation of the primary fragments after scission are further considered. The model gives access to a wide variety of observables, including fission fragments mass, charge, and kinetic energy yields, fragment mean N/Z and post-scission neutron multiplicities, and importantly, their correlations. The latter are crucial to unravel the complexity of the fission process. The parameters of the model were tuned to reproduce experimental observation from thermal neutron-induced fission of 235 U, and next used to discuss the transition from the asymmetric to symmetric fission along the Fm isotopic chain.

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Insight into excitation energy and structure effects in fission from isotopic information in fission yields

Cited by 22 publications

References 51 publications

Total Kinetic Energy of Fission Fragments based on Fission Product Data

Total Kinetic Energy of Fission Fragments based on Fission Product Data

Detailed modeling of odd–even staggering in fission-fragment charge distributions

Fourier-over-Spheroid shape parametrization applied to nuclear fission dynamics

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