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

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S106377880711004X· OSTI ID:21399926

Nadtochy, P N; Adeev, G D ^[1]

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1. Omsk State University (Russian Federation)

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 to k{sub s} = 0.25 was used in the calculations.

• OSTI ID: 21399926
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 11 Vol. 70; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DATA
ENERGY SPECTRA
EQUATIONS
EXPERIMENTAL DATA
FISSILE MATERIALS
FISSION
FISSION FRAGMENTS
FISSIONABLE MATERIALS
INFORMATION
LANGEVIN EQUATION
MATERIALS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUMERICAL DATA
SPECTRA
STOCHASTIC PROCESSES
THREE-DIMENSIONAL CALCULATIONS