The experiments were conducted by L. Qin at the Cyclotron Institute of Texas A&M University.The symmetry energy is the energy difference between symmetric nuclear matter and pure neutron matter at a given density. Symmetry energies were experimentally determined with a series of experiments in which the reactions of 112Sn and 124Sn with projectiles, ranging from 4He,10B, 20Ne, 40Ar to 64Zn, all at the same energy per nucleon, 47 Mev/u, were performed. In this series of experiments different collision systems should lead to different average densities. A series of ion beams was delivered by the K500 Superconducting Cyclotron. The experiments were performed with the 4π multi-detector systems NIMROD
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