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Dissipation and diffusion in nuclear fission

Conference ·
OSTI ID:6633937
;
The dynamical descent of nuclei from the fission saddle point onwards was calculated for two extreme dissipation mechanisms: wall-and-window one-body dissipation and ordinary two-body viscosity. This calculation was done by solving numerically the classical generalized Hamilton equations of motion for a fissioning nucleus, with the nuclear potential energy of deformation calculated in terms of a Coulomb energy and a double volume integral of a Yukawa-plus-exponential folding function, the collective kinetic energy calculated by means of the Werner-Wheeler approximation to incompressible irrotational flow. The most probable dynamical trajectories calculated for the two types of dissipation are shown for the fission of /sup 236/U. Although one-body dissipation leads to compact scission shapes and two-body viscosity leads to elongated scission shapes, both types of dissipation reproduce equally well experimental most probable fission-fragment kinetic energies for the fission of nuclei throughout the periodic table. The relative insensitivity of the final kinetic energies to the dissipation mechanism arises because the reduced postscission kinetic energy resulting from an elongated scission shape with two-body viscosity is compensated by a larger prescission kinetic energy. 3 figures. (RWR)
Research Organization:
Los Alamos Scientific Lab., NM (USA)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
6633937
Report Number(s):
LA-UR-81-301; CONF-810119-1
Country of Publication:
United States
Language:
English

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Related Subjects

652016* -- Nuclear Properties & Reactions
A=220 & above
Theoretical-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
DATA
ENERGY
EVEN-EVEN NUCLEI
FISSION
FISSION FRAGMENTS
HEAVY NUCLEI
INFORMATION
ISOTOPES
KINETIC ENERGY
KINETICS
NUCLEAR FRAGMENTS
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
REACTION KINETICS
THEORETICAL DATA
TRAJECTORIES
URANIUM 236
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES