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Title: Dynamical description of the moments of the energy distribution of fission fragments and scission of a fissile nucleus

A multidimensional stochastic approach to fission dynamics on the basis of three-dimensional Langevin equations is applied systematically to calculating the first four moments of the energy distribution of fission fragments over a broad range of Coulomb parameter values (700 < Z{sup 2}/A{sup 1/3} < 1700). For the scission of a fissile nucleus into fragments, use was made of various criteria traditional in modern fission theory: the vanishing of the neck radius at the scission instant and the equality of the neck radius to about 0.3R{sub 0} at this instant. In calculating the energy distribution, both of the criteria used lead to a fairly good description of experimental data on the first two moments and to a satisfactory description of data on the third and fourth moments of the distribution. However, the quality of the description of available experimental data is insufficiently good for giving preference to any of these criteria. Within three-dimensional Langevin dynamics, it is shown that the vanishing-radius criterion leads to unexpectably good agreement with experimental data on the first four moments of the energy distribution. A modified version of one-body dissipation where the coefficient that takes into account the reduction of the wall-formula contribution was set tomore » k{sub s} = 0.25 was used in the calculations.« less
Authors:
; ;  [1]
  1. Omsk State University (Russian Federation)
Publication Date:
OSTI Identifier:
21399926
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 70; Journal Issue: 11; Other Information: DOI: 10.1134/S106377880711004X; Copyright (c) 2007 Pleiades Publishing, Ltd.
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ENERGY SPECTRA; EXPERIMENTAL DATA; FISSILE MATERIALS; FISSION; FISSION FRAGMENTS; LANGEVIN EQUATION; STOCHASTIC PROCESSES; THREE-DIMENSIONAL CALCULATIONS DATA; EQUATIONS; FISSIONABLE MATERIALS; INFORMATION; MATERIALS; NUCLEAR FRAGMENTS; NUCLEAR REACTIONS; NUMERICAL DATA; SPECTRA