Analysis of fragment yield ratios in the nuclear phase transition

Abstract

The critical phenomena of the liquid-gas phase transition has been investigated in the reactions 78,86Kr+58,64Ni at beam energy of 35 MeV/nucleon using the Landau free energy approach with isospin asymmetry as an order parameter. Fits to the free energy of fragments showed three minima suggesting the system to be in the regime of a first order phase transition. The relation m =-{\partial}F/{\partial}H, which defines the order parameter and its conjugate field H, has been experimentally verified from the linear dependence of the mirror nuclei yield ratio data, on the isospin asymmetry of the source. The slope parameter, which is a measure of the distance from a critical temperature, showed a systematic decrease with increasing excitation energy of the source. Within the framework of the Landau free energy approach, isoscaling provided similar results as obtained from the analysis of mirror nuclei yield ratio data. We show that the external field is primarily related to the minimum of the free energy, which implies a modification of the source concentration Δused in isospin studies.

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• The many facets of the (non relativistic) Nuclear Equation of State
• Heavy-ion Collisions: Direct and indirect probes of the density and temperature dependence of Esym
• Sensitivity study of experimental measures for the nuclear liquid-gas phase transition in the statistical multifragmentation model
• Critical Scaling of Two-component Systems from Quantum Fluctuations
• Competition between fermions and bosons in nuclear matter at low densities and finite temperatures
• Novel technique to extract experimental symmetry free energy information of nuclear matter
• Investigation of the nuclear liquid-gas phase transition in the static AMD