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MULTIFRAGMENTATION AND FRAGMENT FLOW
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1988
Year
Critical PhenomenonEngineeringNuclear PhysicsComputer-aided DesignMolecular DynamicsHeavy Ion PhysicSystem 197NucleationComputational GeometryGeometric ModelingMachine VisionHigh-energy Nuclear ReactionPhysicsNuclear TheoryAtomic PhysicsStructure From MotionQuantum ChemistryFragment Mass DistributionNatural SciencesApplied PhysicsFragment MassSeam CarvingMotion AnalysisMolecular FragmentationMultiscale Modeling
Multifragmentation is studied for the system 197 Au (200 A MeV)+ 197 Au in the Quantum Molecular Dynamics approach. We find that the fragment mass distribution exhibits a power law behaviour with an exponent τ=−2.3. Time and impact parameter dependence of the fragment formation and their implications for the conjectured liquid-vapour phase-transition are investigated. We show that different fragment mass intervals populate different rapidity regions. The transverse momentum flow per nucleon increases with fragment mass in agreement with recent data, and exhibits for A≥4, a strongly enhanced sensitivity to the nuclear equation of state. In-medium effects reduce the fragment flow. The data indicate a stiff equation of state.