dorsal/arxiv
View SchemaPhase Transitions in Warm, Asymmetric Nuclear Matter
| Authors | Horst Mueller, Brian D. Serot |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9505013 |
| URL | https://arxiv.org/abs/nucl-th/9505013 |
| DOI | 10.1103/PhysRevC.52.2072 |
| Journal | Phys.Rev.C52:2072-2091,1995 |
Abstract
A relativistic mean-field model of nuclear matter with arbitrary proton fraction is studied at finite temperature. An analysis is performed of the liquid-gas phase transition in a system with two conserved charges (baryon number and isospin) using the stability conditions on the free energy, the conservation laws, and Gibbs' criteria for phase equilibrium. For a binary system with two phases, the coexistence surface (binodal) is two-dimensional. The Maxwell construction through the phase-separation region is discussed, and it is shown that the stable configuration can be determined uniquely at every density. Moreover, because of the greater dimensionality of the binodal surface, the liquid-gas phase transition is continuous (second order by Ehrenfest's definition), rather than discontinuous (first order), as in familiar one-component systems. Using a mean-field equation of state calibrated to the properties of nuclear matter and finite nuclei, various phase-separation scenarios are considered. The model is then applied to the liquid-gas phase transition that may occur in the warm, dilute matter produced in energetic heavy-ion collisions. In asymmetric matter, instabilities that produce a liquid-gas phase separation arise from fluctuations in the proton concentration (chemical instability), rather than from fluctuations in the baryon density (mechanical instability).
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"abstract": "A relativistic mean-field model of nuclear matter with arbitrary proton\nfraction is studied at finite temperature. An analysis is performed of the\nliquid-gas phase transition in a system with two conserved charges (baryon\nnumber and isospin) using the stability conditions on the free energy, the\nconservation laws, and Gibbs\u0027 criteria for phase equilibrium. For a binary\nsystem with two phases, the coexistence surface (binodal) is two-dimensional.\nThe Maxwell construction through the phase-separation region is discussed, and\nit is shown that the stable configuration can be determined uniquely at every\ndensity. Moreover, because of the greater dimensionality of the binodal\nsurface, the liquid-gas phase transition is continuous (second order by\nEhrenfest\u0027s definition), rather than discontinuous (first order), as in\nfamiliar one-component systems. Using a mean-field equation of state calibrated\nto the properties of nuclear matter and finite nuclei, various phase-separation\nscenarios are considered. The model is then applied to the liquid-gas phase\ntransition that may occur in the warm, dilute matter produced in energetic\nheavy-ion collisions. In asymmetric matter, instabilities that produce a\nliquid-gas phase separation arise from fluctuations in the proton concentration\n(chemical instability), rather than from fluctuations in the baryon density\n(mechanical instability).",
"arxiv_id": "nucl-th/9505013",
"authors": [
"Horst Mueller",
"Brian D. Serot"
],
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"doi": "10.1103/PhysRevC.52.2072",
"journal_ref": "Phys.Rev.C52:2072-2091,1995",
"title": "Phase Transitions in Warm, Asymmetric Nuclear Matter",
"url": "https://arxiv.org/abs/nucl-th/9505013"
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