Dissipation-fluctuation dynamics of the formation of fission-fragment mass distributions

Journal Article · Thu May 01 04:00:00 EDT 1986 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:5141115

Adeev, G D; Gonchar, I I; Marchenko, L A; Pischasov, N I

The variances of the fission-fragment mass distributions for excited compound nuclei (nuclear temperature at the saddle point T/sub s//sub d/ approx. =1.5 MeV) are computed in a broad range of values of the parameter Z/sup 2//A (from 30 to 44). The computations are carried out in a model based on the Fokker-Planck equation (FPE) for the distribution function for the three most important collective coordinates describing the deformation of a fissioning nucleus (the elongation, mass asymmetry, and neck parameter) and the corresponding conjugate momenta. The model allows for a realistic coordinate dependence of all the FPE coefficients, as computed in the hydrodynamic approximation. The effect of angular momentum on the magnitude of the variance of the mass distribution is studied. The calculations reproduce the observed significant growth in the region Z/sup 2//A>35 of the variance of the fission-fragment mass distribution for a compound nucleus.

• Research Organization: Omsk State University
• OSTI ID: 5141115
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 43:5; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

653006* -- Nuclear Theory-- Spontaneous & Induced Fission
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
COMPOUND NUCLEI
DEFORMATION
DIFFERENTIAL EQUATIONS
DISTRIBUTION
EQUATIONS
FISSION FRAGMENTS
FLUID MECHANICS
FOKKER-PLANCK EQUATION
HYDRODYNAMICS
MASS DISTRIBUTION
MECHANICS
NUCLEAR DEFORMATION
NUCLEAR FRAGMENTS
PARTIAL DIFFERENTIAL EQUATIONS
SPATIAL DISTRIBUTION
STATISTICAL MECHANICS