Nuclear matter symmetry energy at 0.03 <= rho/rho(0) <= 0.2
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Measurements of the density dependence of the symmetry free energy in low-density clustered matter have been extended using the Neutron Ion Multidetector for Reaction Oriented Dynamics at Texas A&M University. Thermal coalescence models were employed to extract densities and temperatures T for evolving systems formed in collisions of 47A MeV 40Ar+112Sn,124Sn and 64Zn+112Sn, 124Sn. Densities of 0. 03/00.2 and temperatures in the range 5-10 MeV have been sampled. The symmetry free energy coefficients are found to be in good agreement with values calculated using a quantum statistical model. Values of the corresponding symmetry free energy coefficient are derived from the data using entropies derived from the model. 2012 American Physical Society.