Transverse Velocity Scaling in Au+Au Fragmentation

Abstract

Invariant transverse-velocity spectra of intermediate-mass fragments were measured with the 4-pi multi-detector system INDRA for collisions of Au on Au at incident energies between 40 and 150 MeV per nucleon. Their scaling properties as a function of incident energy and atomic number Z are used to distinguish and characterize the emissions in (i) peripheral collisions at the projectile and target rapidities, and in (ii) central and (iii) peripheral collisions near mid-rapidity. The importance of dynamical effects is evident in all three cases and their origin is discussed.

4 pages, 3 eps figures, RevTeX4, submitted to Phys. Rev

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• Thermal and Chemical Freeze-out in Spectator Fragmentation
• Statistical Multifragmentation of Non-Spherical Expanding Sources in Central Heavy-Ion Collisions
• Fragmentation in Peripheral Heavy-Ion Collisions: from Neck Emission to Spectator Decays
• From fusion to total disassembly: global stopping in heavy-ion collisions
• Comparison of mid-velocity fragment formation with projectile-like decay
• Yield scaling, size hierarchy and fluctuations of observables in fragmentation of excited heavy nuclei
• Multiplicity correlations of intermediate-mass fragments with pions and fast protons in 12C + 197Au
• Source shape determination with directional fragment-fragment velocity correlations