Time dependence of critical behavior in multifragmentation

Abstract

We study signatures of critical behavior in microscopic simulations of small, highly excited Lennard-Jones drops. We focus our attention on the behavior of the system at the time of fragment formation (which takes place in phase space) and compare the results with the corresponding ones obtained at asymptotic times (experimentally accessible). The four critical exponents ($\tau$,$\beta$, $\sigma$ and $\gamma$) found at fragmentation time have shown to be stable against time evolution, indicating that the asymptotic stage reflects accurately the physics at fragmentation time. Even though evidence of critical behavior arises from the calculations, we can not affirm that the system is performing a second order like phase transition.

9 pages, 5 figures

References in corpus (4)

• Caloric curves and critical behavior in nuclei
• Event-by-Event Analysis of Proton-Induced Nuclear Multifragmentation: Determination of Phase Transition Universality-Class in System with Extreme Finite-Size Constraints
• Scaling in the Lattice Gas Model
• Non equilibrium effects in fragmentation

Cited by in corpus (5)

• Fluctuations of fragment observables
• Connection between the Largest Lyapunov Exponent, Density Fluctuation and Multifragmentation in Excited Nuclear Systems
• Tracking energy fluctuations from fragment partitions in the Lattice Gas model
• Dynamics and thermodynamics of fragment emission from excited sources
• Equation of State and Phase Transitions in the Nuclear and Hadronic Systems