Evolution of the symmetry energy of hot neutron-rich matter formed in heavy-ion reactions

Bao-An Li and Lie-Wen Chen
Phys. Rev. C 74, 034610 – Published 28 September 2006

Abstract

It is shown that the experimentally observed decrease of nuclear symmetry energy with increasing centrality or excitation energy in isotopic scaling analyses of heavy-ion reactions can be well understood analytically within a degenerate Fermi gas model. The evolution of the symmetry energy is found to be mainly due to the variation in the freeze-out density rather than temperature. The isoscaling analyses are useful for probing the interaction part of the nuclear symmetry energy, provided that both the freeze-out temperature and density of the fragments can be inferred simultaneously from the experiments.

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  • Received 29 April 2006

DOI:https://doi.org/10.1103/PhysRevC.74.034610

©2006 American Physical Society

Authors & Affiliations

Bao-An Li1 and Lie-Wen Chen2,3

  • 1Department of Physics, Texas A&M University-Commerce, Commerce, Texas 75429, USA, and Department of Chemistry and Physics, Post Office Box 419, Arkansas State University, State University, Arkansas 72467-0419, USA
  • 2Institute of Theoretical Physics, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
  • 3Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou, 730000, People's Republic of China

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Issue

Vol. 74, Iss. 3 — September 2006

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