Investigation of the nuclear liquid-gas phase transition in the static AMD

Abstract

Nuclear liquid-gas phase transitions are investigated in the framework of static antisymmetrized molecular dynamics (static AMD) model under either a constant volume or a constant pressure. A deuteron quadrupole momentum fluctuation thermometer is applied to extract the temperature of fragmenting systems of ${}^{36}$Ar and ${}^{100}$Sn. A plateau structure of caloric curves is observed under a constant volume for those system with a density $\rho \le$ 0.03 fm${}^{-3}$. A clear backbending in the caloric curves, which indicates a first order phase transition, is observed under a constant pressure with all pressures studied. The similar behavior of caloric curves of ${}^{36}$Ar and ${}^{100}$Sn systems indicates that there is no strong system size effect under a constant volume or a constant pressure. Both the mass distributions and the light particle multiplicities show a strong $\alpha$ clusterization at low excitation energies in the static AMD simulations. The liquid-gas phase transition measures of the multiplicity derivative (dM/dT) and the normalized variance of $Z_{max}$ (NVZ) are applied. The experimental caloric curves are also compared with those of ${}^{100}$Sn of the static AMD simulations under both the constant volume and the constant pressure conditions. Discussions are presented with the available experimental results and those from the static AMD simulations. Large errors in the experimental temperature measurements and those in the reconstruction technique for the primary fragmenting source hinder to draw a conclusion whether the phase transition occurs under either a constant volume or a constant pressure. This study suggests that different measures for the liquid-gas phase transitions should be examined besides the caloric curves in order to draw a conclusion.

arXiv comment10 figures

References in corpus (44)

• Caloric curves and critical behavior in nuclei
• Nuclear multifragmentation and phase transition for hot nuclei
• The liquid to vapor phase transition in excited nuclei
• Application of Information Theory in Nuclear Liquid Gas Phase Transition
• A study of the phase transition in the usual statistical model for nuclear multifragmentation
• Shannon Information Entropy in Heavy-ion Collisions
• Antisymmetrized molecular dynamics of wave packets with stochastic incorporation of Vlasov equation
• Critical Behavior in Light Nuclear Systems: Experimental Aspects
• Laboratory Tests of Low Density Astrophysical Equations of State
• Evidence for Spinodal Decomposition in Nuclear Multifragmentation
• Breakup Temperature of Target Spectators in Au + Au Collisions at E/A = 1000 MeV
• Statistical evolution of isotope composition of nuclear fragments
• The many facets of the (non relativistic) Nuclear Equation of State
• Measuring the Temperature of Hot Nuclear Fragments
• Symmetry energy for fragmentation in dynamical nuclear collisions
• Compatibility of localized wave packets and unrestricted single particle dynamics for cluster formation in nuclear collisions
• Universal fluctuations in heavy-ion collisions in the Fermi energy domain
• Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation
• Bimodal behavior of the heaviest fragment distribution in projectile fragmentation
• Bimodality: a possible experimental signature of the liquid-gas phase transition of nuclear matter
• The Quantum Nature of a Nuclear Phase Transition
• Model-independent tracking of criticality signals in nuclear multifragmentation data
• Microscopic predictions of the nuclear matter liquid-gas phase transition
• Critical behavior of the isotope yield distributions in the Multifragmentation Regime of Heavy Ion Reactions
• Bimodality as a signal of Liquid-Gas phase transition in nuclei?
• The complement: a solution to liquid drop finite size effects in phase transitions
• Evidence of Critical Behavior in the Disassembly of Nuclei with A ~ 36
• Bimodality - a Sign of Critical Behavior in Nuclear Reactions
• Phase transition dynamics for hot nuclei
• Relevance of equilibrium in multifragmentation
• Critical parameters of liquid-gas phase transition in thermal symmetric and asymmetric nuclear matter
• Multiplicity Derivative: A new signature of first order phase transition in intermediate energy heavy ion collision
• Experimental reconstruction of primary hot isotopes and characteristic properties of the fragmenting source in the heavy ion reactions near the Fermi energy
• Bimodality - a general feature of heavy ion reactions
• Analysis of fragment yield ratios in the nuclear phase transition
• Constrained caloric curves and phase transition for hot nuclei
• Towards the critical behavior for the light nuclei by NIMROD detector
• Finite-size scaling phenomenon of nuclear liquid--gas phase transition probes
• Coulomb corrections to density and temperature of bosons in heavy ion collisions
• Further studies of multiplicity derivative in models of heavy ion collision at intermediate energies as a probe for phase transition
• First-order derivative of cluster size as a new signature of phase transition in heavy ion collisions at intermediate energies
• Sensitivity study of experimental measures for the nuclear liquid-gas phase transition in the statistical multifragmentation model
• Statistical analysis of experimental multifragmentation events in ${}^{64}$Zn + ${}^{112}$Sn at 40 MeV/nucleon
• Effect of liquid drop model parameters on nuclear liquid gas phase transition