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

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

2006-04-29

arxiv.org/abs/nucl-th/0605002v2

Phys.Rev. C74 (2006) 034610

Physics

Nuclear Physics

Nuclear Theory

6 pages, 2 figures. Title changed little, comments on extracting the symmetry energy from the isoscaling phenomenon are added.

Scientific paper

10.1103/PhysRevC.74.034610

It is shown that the experimentally observed decrease of the nuclear symmetry energy with the increasing centrality or the 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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