Central collisions in intermediate energy heavy-ion reactions. [Micro- and macroscopic theory, extended time-dependent Hartree-Fock approximation]
The critical collisions in intermediate energy heavy-ion reactions are examined from both a microscopic and macroscopic viewpoint. In the microscopic description the proper tool is the extended TDHF approximation involving both the mean field and the particle collisions. To understand the underlying physics, the effect of the mean field and the effect of particle collisions are studied separately. It is found that th sudden increase in the density of the overlapping region can cause the volcano effect, leading to the complete disintegration of one of the nuclei. The self-consistent mean field also gives rise to the bunching instability when the two Fermi spheres of the colliding nucleons separate. The collision between nucleons, on the other hand, leads to irreversible dissipation, thermalization, and the possibility of a hydrodynamical description of the dynamics. Next is studied the dynamics of central collisions using the hydrodynamical description for many combinations of targets and projectiles at different energies. The formation of shock waves, sidesplash, and the complete disintegration of the whole nucleus are examined. Nuclear viscosity is found to affect the angular distribution of the reaction products and also the maximum compression ratio achieved during the collision. 28 references.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5893527
- Report Number(s):
- CONF-790743-5; TRN: 79-020526
- Resource Relation:
- Conference: Symposium on heavy ion physics from 10-200 MeV/A, Upton, NY, USA, 16 Jul 1979
- Country of Publication:
- United States
- Language:
- English
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CALCIUM 40 TARGET
OXYGEN 16 REACTIONS
GOLD 197 TARGET
NEON 20 REACTIONS
HEAVY ION REACTIONS
CENTRAL POTENTIAL
NUCLEAR REACTION KINETICS
NUCLEON-NUCLEON INTERACTIONS
KINETICS
ANGULAR DISTRIBUTION
COMPRESSION
ENERGY DEPENDENCE
FERMIONS
GRAPHS
HARTREE-FOCK METHOD
HYDRODYNAMIC MODEL
INSTABILITY
IRREVERSIBLE PROCESSES
LINEAR MOMENTUM
MEV RANGE 100-1000
SELF-CONSISTENT FIELD
SHOCK WAVES
SPATIAL DISTRIBUTION
SPHERICAL CONFIGURATION
THEORETICAL DATA
TIME DEPENDENCE
VISCOSITY
BARYON-BARYON INTERACTIONS
CHARGED-PARTICLE REACTIONS
CONFIGURATION
DATA
DATA FORMS
DISTRIBUTION
ENERGY RANGE
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
POTENTIALS
REACTION KINETICS
STATISTICAL MODELS
TARGETS
THERMODYNAMIC MODEL
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