Temperature and energy partition in fragmentation

Abstract

We study fragmentation of small atomistic clusters via molecular dynamics. We calculate the time scales related to fragment formation and emission. We also show that some degree of thermalization is achieved during the expansion process, which allows the determination of a local temperature. In this way we can calculate the break-up temperature as a function of excitation energy, i.e. the fragmentation caloric curve. Fragmentation appears as a rather constant temperature region of the caloric curve. Furthermore, we show that different definitions of temperature, related to different degrees of freedom, yield very similar values.

23 pages, 11 figs

References in corpus (1)

• Temperatures of Exploding Nuclei

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• Correlations and Characterization of Emitting Sources
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• Non equilibrium effects in fragmentation
• Molecular Dynamics for Dense Matter
• Enhancement of kinetic energy fluctuations due to expansion
• Time dependence of critical behavior in multifragmentation
• Selected aspects of the classical molecular dynamics of N bodies in strong interaction
• Kinetic approach to the cluster liquid-gas transition
• Dynamics and thermodynamics of fragment emission from excited sources
• Limitation of energy deposition in classical N body dynamics
• Extended Gibbs ensembles with flow
• Expansion dynamics of Lennard-Jones systems
• Equation of State and Phase Transitions in the Nuclear and Hadronic Systems