Statistical nature of cluster emission in nuclear liquid-vapour phase coexistence

Abstract

The emission of nuclear clusters is investigated within the framework of isospin dependent lattice gas model and classical molecular dynamics model. It is found that the emission of individual cluster which is heavier than proton is almost Poissonian except near the transition temperature at which the system is leaving the liquid-vapor phase coexistence and the thermal scaling is observed by the linear Arrhenius plots which is made from the average multiplicity of each cluster versus the inverse of temperature in the liquid vapor phase coexistence. The slopes of the Arrhenius plots, {\it i.e.} the "emission barriers", are extracted as a function of the mass or charge number and fitted by the formula embodied with the contributions of the surface energy and Coulomb interaction. The good agreements are obtained in comparison with the data for low energy conditional barriers. In addition, the possible influences of the source size, Coulomb interaction and "freeze-out" density and related physical implications are discussed.

References in corpus (24)

• Molecular Dynamics for Fermions
• Negative heat capacity in the critical region of nuclear fragmentation: an experimental evidence of the liquid-gas phase transition
• Application of Information Theory in Nuclear Liquid Gas Phase Transition
• A unified description for nuclear equation of state and fragmentation in heavy ion collisions
• Event-by-Event Analysis of Proton-Induced Nuclear Multifragmentation: Determination of Phase Transition Universality-Class in System with Extreme Finite-Size Constraints
• First Order Phase Transition in Intermediate Energy Heavy Ion Collisions
• The lattice gas model with isospin-dependent interactions
• Universal Behavior of Lyapunov Exponents in Unstable Systems
• Isospin influences on particle emission and critical phenomenon in nuclear dissociation
• A schematic model for fragmentation and phase transition in nuclear collisions
• Lattice gas model for fragmentation: From Argon on Scandium to Gold on Gold
• Nuclear multifragmentation, percolation and the Fisher Droplet Model: common features of reducibility and thermal scaling
• A model for nuclear matter fragmentation: phase diagram and cluster distributions
• Source size scaling of fragment production in projectile breakup
• Isospin Lattice-Gas Model and Liquid-Gas Phase Transition in Asymmetric Nuclear Matter
• Improvement of the nucleon emission process and the statistical property in molecular dynamics
• Statistical Models of Nuclear Fragmentation
• Z-dependent Barriers in Multifragmentation from Poissonian Reducibility and Thermal Scaling
• Sequential Decay Distortion of Goldhaber Model Widths for Spectator Fragments
• Cluster emission and phase transition behaviours in nuclear disassembly
• Cluster Emission and Phase Transition Behavior in the Nuclear Disassembly
• Correlations in Nuclear Arrhenius-Type Plots
• Resilient Reducibility in Nuclear Multifragmentation
• Microcanonical Lattice Gas Model for Nuclear Disassembly