Dynamics of nuclear fission and heavy-ion reactions

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6372871

Nix, J R; Sierk, A J

Large-amplitude collective motion in fission and heavy-ion reactions is studied by solving classical equations of motion for the time evolution of the nuclear shape. In the nuclear potential energy of deformation, the generalized surface energy was calculated by means of a double volume integral of a Yukawa-plus-exponential function, which was obtained by requiring that two semi-infinite slabs of constant-density nuclear matter have minimum energy at zero separation. The collective kinetic energy is calculated for nuclear flow that is a superposition of incompressible, nearly irrotational collective-shape motion and rigid-body rotation. Nuclear dissipation is included by means of the Rayleigh dissipation function, which depends upon the physical mechanism that converts collective energy into internal energy. For both ordinary two-body viscosity and a combined wall and window one-body dissipation, fission-fragment kinetic energies are calculated for the fission of nuclei throughout the periodic table and compare with experimental results. Finally, the one-body dynamics of nucleons inside a cylinder colliding with a moving piston is explicitly studied by solving exactly the collisionless Boltzmann equation for the distribution function. By examining the relative phases of the pressure at the piston and the piston's velocity, a dissipative force and an elastic restoring force can be separately identified. 9 references.

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6372871
• Report Number(s): LA-UR-79-1511; CONF-790660-3
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
653006 -- Nuclear Theory-- Spontaneous & Induced Fission
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR DISTRIBUTION
BARYONS
BOLTZMANN EQUATION
CHARGED-PARTICLE REACTIONS
COLLECTIVE MODEL
CONFIGURATION
CROSS SECTIONS
CYLINDRICAL CONFIGURATION
DATA
DATA FORMS
DEFORMATION
DIFFERENTIAL EQUATIONS
DISSIPATION FACTOR
DISTRIBUTION
DISTRIBUTION FUNCTIONS
ELASTIC SCATTERING
ELASTICITY
ELEMENTARY PARTICLES
ENERGY
EQUATIONS
EQUATIONS OF MOTION
EVEN-EVEN NUCLEI
FERMIONS
FISSION
FISSION FRAGMENTS
GRAPHS
HADRONS
HEAVY ION REACTIONS
INFORMATION
INTEGRALS
INTERMEDIATE MASS NUCLEI
ISOTOPES
KINETIC ENERGY
KINETICS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MATTER
MECHANICAL PROPERTIES
NUCLEAR DEFORMATION
NUCLEAR FORCES
NUCLEAR FRAGMENTS
NUCLEAR MATTER
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
PALLADIUM 110
PALLADIUM 110 TARGET
PALLADIUM ISOTOPES
POTENTIALS
REACTION KINETICS
SCATTERING
SILICON 28 TARGET
STABLE ISOTOPES
TARGETS
TENSILE PROPERTIES
THEORETICAL DATA
TIME DEPENDENCE
TWO-BODY PROBLEM
VOLUME
YUKAWA POTENTIAL