Dynamical calculations of nuclear fission and heavy-ion reactions

Conference · Sun Jan 01 00:00:00 EST 1984

OSTI ID:5992856

Nix, J R; Sierk, A J

With the goal of determining the magnitude and mechanism of nuclear dissipation from comparisons of predictions with experimental data, we describe recent calculations in a unified macroscopic-microscopic approach to large-amplitude collective nuclear motion such as occurs in fission and heavy-ion reactions. We describe the time dependence of the distribution function in phase space of collective coordinates and momenta by a generalized Fokker-Planck equation. The nuclear potential energy of deformation is calculated as the sum of repulsive Coulomb and centrifugal energies and an attractive Yukawa-plus-exponential potential, the inertia tensor is calculated for a superposition of rigid-body rotation and incompressible, nearly irrotational flow by use of the Werner-Wheeler method, and the dissipation ensor that describes the conversion of collective energy into single-particle excitation energy is calculated for two prototype mechanisms that represent opposite extremes of large and small dissipation. We solve the generalized Hamilton equations of motion for the first moments of the distribution function to obtain the mean translational fission-fragment kinetic energy and mass of a third fragment that sometimes forms between the two end fragments, as well as dynamical thresholds, capture cross sections, and ternary events in heavy-ion reactions. 33 references.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5992856
• Report Number(s): LA-UR-84-4008; CONF-841259-1; ON: DE85005580
• Resource Relation: Conference: International conference on nuclear physics, Bombay, India, 27 Dec 1984
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FISSION
ENERGY LOSSES
NUCLEAR MODELS
HEAVY ION REACTIONS
CAPTURE
COLLECTIVE EXCITATIONS
CROSS SECTIONS
DISTRIBUTION FUNCTIONS
FISSION FRAGMENTS
FOKKER-PLANCK EQUATION
KINETIC ENERGY
NUCLEAR DEFORMATION
NUCLEAR FRAGMENTS
NUCLEAR POTENTIAL
TIME DEPENDENCE
CHARGED-PARTICLE REACTIONS
DEFORMATION
DIFFERENTIAL EQUATIONS
ENERGY
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EXCITATION
FUNCTIONS
LOSSES
MATHEMATICAL MODELS
NUCLEAR REACTIONS
PARTIAL DIFFERENTIAL EQUATIONS
POTENTIALS
653003* - Nuclear Theory- Nuclear Reactions & Scattering
653006 - Nuclear Theory- Spontaneous & Induced Fission