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Title: Isospin dependent thermodynamics of fragmentation

Abstract

The thermal and phase properties of a multifragmentation model that uses clusters as degrees of freedom are explored as a function of isospin. Good qualitative agreement is found with the phase diagram of asymmetric nuclear matter as established by different mean-field models. In particular, from the convexity properties of the nuclear entropy, we show that uncharged finite nuclei display first- and second-order liquid-gas-like phase transitions. Different quantities are examined to connect the thermal properties of the system to cluster observables. In particular, we show that fractionation is only a loose indication of phase coexistence. A simple analytical formula is proposed and tested to evaluate the symmetry (free) energy from the widths of isotopic distributions. Assuming that one may restore the isotopic composition of breakup fragments, it is found that some selected isotopic observables can allow one to quantitatively access the freeze-out symmetry energy in multifragmentation experiments.

Authors:
;  [1]
  1. NIPNE, Bucharest-Magurele, POB-MG 6, Romania and Institut de Physique Nucleaire, IN2P3-CNRS, F-91406 Orsay Cedex (France) and LPC - IN2P3-CNRS/Ensicaen et Universite, F-14050 Caen Cedex (France)
Publication Date:
OSTI Identifier:
20995214
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.044605; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DEGREES OF FREEDOM; ENTROPY; FRACTIONATION; FRAGMENTATION; FREEZING OUT; ISOSPIN; ISOTOPE RATIO; LIQUIDS; MEAN-FIELD THEORY; NUCLEAR MATTER; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; SYMMETRY; THERMODYNAMICS; WIDTH

Citation Formats

Raduta, Ad. R., and Gulminelli, F. Isospin dependent thermodynamics of fragmentation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.044605.
Raduta, Ad. R., & Gulminelli, F. Isospin dependent thermodynamics of fragmentation. United States. doi:10.1103/PHYSREVC.75.044605.
Raduta, Ad. R., and Gulminelli, F. Sun . "Isospin dependent thermodynamics of fragmentation". United States. doi:10.1103/PHYSREVC.75.044605.
@article{osti_20995214,
title = {Isospin dependent thermodynamics of fragmentation},
author = {Raduta, Ad. R. and Gulminelli, F.},
abstractNote = {The thermal and phase properties of a multifragmentation model that uses clusters as degrees of freedom are explored as a function of isospin. Good qualitative agreement is found with the phase diagram of asymmetric nuclear matter as established by different mean-field models. In particular, from the convexity properties of the nuclear entropy, we show that uncharged finite nuclei display first- and second-order liquid-gas-like phase transitions. Different quantities are examined to connect the thermal properties of the system to cluster observables. In particular, we show that fractionation is only a loose indication of phase coexistence. A simple analytical formula is proposed and tested to evaluate the symmetry (free) energy from the widths of isotopic distributions. Assuming that one may restore the isotopic composition of breakup fragments, it is found that some selected isotopic observables can allow one to quantitatively access the freeze-out symmetry energy in multifragmentation experiments.},
doi = {10.1103/PHYSREVC.75.044605},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}