Dynamical interpretation of average fission-fragment kinetic energy systematics and nuclear scission

Nadtochy, P. N.; Адеев, Г. Д.

doi:10.1103/physrevc.72.054608

Cited by 50 publications

(63 citation statements)

References 38 publications

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“…The macroscopic properties of the potential-energy landscape of the fissioning system are attributed to the strongly deformed fissioning system, which are deduced from mass distributions at high excitation energies (Rusanov 1997) and Langevin calculations (Nadtochy et al 2005). The microscopic properties of the potential-energy landscape of the fissioning system are given by the qualitative features of the shell structure in the nascent fragments.…”

Section: Fission Fragment Distributionsmentioning

confidence: 99%

Neutron-induced astrophysical reaction rates for translead nuclei

Panov

Korneev

Rauscher

et al. 2010

A&A

116

107

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Neutron-induced reaction rates, including fission and neutron capture, are calculated in the temperature range 10 8 ≤ T (K) ≤ 10 10 within the framework of the statistical model for targets with the atomic number 84 ≤ Z ≤ 118 (from Po to Uuo) from the neutron to the proton drip-line. Four sets of rates have been calculated, utilizing -where possible -consistent nuclear data for neutron separation energies and fission barriers from Thomas-Fermi (TF), Extended Thomas-Fermi plus Strutinsky Integral (ETFSI), Finite-Range Droplet Model (FRDM) and Hartree-Fock-Bogolyubov (HFB) predictions. Tables of calculated values as well as analytic seven parameter fits in the standard REACLIB format are supplied. We also discuss the sensitivity of the rates to the input, aiming at a better understanding of the variations introduced by the nuclear input.

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Section: Fission Fragment Distributionsmentioning

confidence: 99%

Neutron-induced astrophysical reaction rates for translead nuclei

Panov

Korneev

Rauscher

et al. 2010

A&A

116

107

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“…In addition, the concept of nuclear deformation, which is a particular realization of the generic spontaneous symmetry breaking so essential to the success of the EDF approach, allows to cast bridges between microscopic and phenomenological models of fission. Historically, these models, where the nucleus is modeled as a deformed liquid drop with several correc-tions of quantum origin, have been extraordinarily successful in applications, see, e.g., [10][11][12][13][14][15][16] for a selection of some recent applications.…”

Section: Introductionmentioning

confidence: 99%

Fission fragment charge and mass distributions inPu239(n,f)in the adiabatic nuclear energy density functional theory

Regnier

Dubray

Schunck³

et al. 2016

Phys. Rev. C

141

120

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Background: Accurate knowledge of fission fragment yields is an essential ingredient of numerous applications ranging from the formation of elements in the r-process to fuel cycle optimization for nuclear energy. The need for a predictive theory applicable where no data is available, together with the variety of potential applications, is an incentive to develop a fully microscopic approach to fission dynamics.Purpose: In this work, we calculate the pre-neutron emission charge and mass distributions of the fission fragments formed in the neutron-induced fission of 239 Pu using a microscopic method based on nuclear density functional theory (DFT).Methods: Our theoretical framework is the nuclear energy density functional (EDF) method, where large amplitude collective motion is treated adiabatically using the time dependent generator coordinate method (TDGCM) under the Gaussian overlap approximation (GOA). In practice, the TDGCM is implemented in two steps. First, a series of constrained EDF calculations map the configuration and potential energy landscape of the fissioning system for a small set of collective variables (in this work, the axial quadrupole and octupole moments of the nucleus). Then, nuclear dynamics is modeled by propagating a collective wave packet on the potential energy surface. Fission fragment distributions are extracted from the flux of the collective wave packet through the scission line.Results: We find that the main characteristics of the fission charge and mass distributions can be well reproduced by existing energy functionals even in two-dimensional collective spaces. Theory and experiment agree typically within 2 mass units for the position of the asymmetric peak. As expected, calculations are sensitive to the structure of the initial state and the prescription for the collective inertia. We emphasize that results are also sensitive to the continuity of the collective landscape near scission.Conclusions: Our analysis confirms that the adiabatic approximation provides an effective scheme to compute fission fragment yields. It also suggests that, at least in the framework of nuclear DFT, three-dimensional collective spaces may be a prerequisite to reach 10% accuracy in predicting pre-neutron emission fission fragment yields.

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“…This is expected for the mass-asymmetry degree of freedom, mainly due to the associated large inertia [14]. On the other hand, the N/Z degree of freedom [15] and the deformation [16] have a small inertia and are essentially determined by the available number of states at scission. We consider that the probability for each fission channel is determined by integrals over the level density up to the available energy at the saddle point.…”

Section: Formulation Of the Modelmentioning

confidence: 97%

Fission-fragment and neutron data traced back to the macroscopic and microscopic properties of the fissioning systems

Schmidt

Jurado

2010

EPJ Web of Conferences

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Abstract.A new model description of fission-fragment yields and prompt neutron emission is developed. The yields of the different fission channels and their properties are attributed to the number of relevant states above the potential-energy landscape on the fission path at the moment of dynamical freeze-out, which is specific to the collective coordinate considered. The model combines well established ideas with novel concepts. The separability principle of macroscopic properties of the compound nucleus and microscopic properties of the fragments strongly reduces the number of model parameters and assures a high predictive power. The recently discovered energy-sorting mechanism in superfluid nuclear dynamics determines the sharing of intrinsic excitation energy at scission and the enhancement of even-odd structure in asymmetric splits.

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Dynamical interpretation of average fission-fragment kinetic energy systematics and nuclear scission

Cited by 50 publications

References 38 publications

Neutron-induced astrophysical reaction rates for translead nuclei

Neutron-induced astrophysical reaction rates for translead nuclei

Fission fragment charge and mass distributions inPu239(n,f)in the adiabatic nuclear energy density functional theory

Fission-fragment and neutron data traced back to the macroscopic and microscopic properties of the fissioning systems

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