Effect of Cluster Formation on Isospin Asymmetry in the Liquid-Gas Phase Transition Region Effect of Cluster Formation on Isospin Asymmetry in the Liquid-Gas Phase Transition Region
نویسنده
چکیده
Abstract: Nuclear matter within the liquid-gas phase transition region is inNuclear matter within the liquid-gas phase transition region is investigated in a mean-field two-component Fermi-gas model. Following largely analytic considerations, it is shown that: (1) Due to density dependence of asymmetry energy, some of the neutron excess from the high-density phase could be expelled into the low-density region. (2) Formation of clusters in the gas phase tends to counteract this trend, making the gas phase more liquid-like and reducing the asymmetry in the gas phase. Flow of asymmetry between the spectator and midrapidity region in reactions is discussed and a possible inversion of the flow direction is indicated. PACS. 25.70.Mn Projectile and target fragmentation. PACS. 25.70.Pq Multifragment emission and correlations. PACS. 21.65.+f Nuclear matter. Typeset using REVTEX
منابع مشابه
ar X iv : n uc l - th / 9 60 80 25 v 1 1 3 A ug 1 99 6 Isospin Lattice - Gas Model and Liquid - Gas Phase Transition in Asymmetric Nuclear Matter
An isospin lattice-gas model, which is a spin-1 Ising model, is employed to investigate the liquid-gas phase transition in asymmetric nuclear matter. We consider nuclear matter as a lattice where each lattice site can be either empty or occupied by a proton or a neutron, with a nearest-neighbor interaction among the nucleons. With the Bragg-Williams mean field approximation, we calculate variou...
متن کاملIsospin and Momentum Dependence of Liquid-gas Phase Transition in Hot Asymmetric Nuclear Matter
The liquid-gas phase transition in hot neutron-rich nuclear matter is investigated within a self-consistent thermal model using different interactions with or without isospin and/or momentum dependence. The boundary of the phase-coexistence region is shown to be sensitive to the density dependence of the nuclear symmetry energy as well as the isospin and momentum dependence of the nuclear inter...
متن کاملNuclear liquid-gas phase transition in generalized thermo-statistics
A new calculus of nuclear liquid-gas phase transition in the standard thermostatistics is applied to the generalized thermo-statistics. Because the phase equilibrium is de ned in terms of intensive temperature and conjugate extensive entropy, we have to solve higher-order simultaneous nonlinear equations than those in the standard thermo-statistics. The features of phase transition are essentia...
متن کامل60 80 08 v 2 2 O ct 2 00 6 Spin ordered phase transitions in isospin asymmetric nuclear matter
Spin polarized states in nuclear matter with Skyrme effective forces are studied on the base of a Fermi liquid theory for a wide range of isospin asymmetries and densities. There are a few possible scenarios of spin ordered phase transitions: (a) nuclear matter with SLy4 interaction undergoes at some critical density a phase transition to a spin polarized state with the oppositely directed spin...
متن کاملChemical and mechanical instability in hot isospin - asymmetric nuclear matter
Using phenomenological equations of state, we study the chemical and mechanical instabilities in hot isospin-asymmetric nuclear matter. Both instabilities are found to depend strongly on the isospin asymmetry of the nuclear matter. For a chemically and mechanically stable asymmetric nuclear matter, a lower neutron excess is found in the liquid phase than in the gas phase. Furthermore, the neutr...
متن کامل