Abstract
Using the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model, the balance energies of free neutrons, free protons and Z=1 particles (including free protons, deuterons and tritons) from mass symmetric heavy-ion collisions with isotopes, isobars and isotones are studied. The influence of nuclear symmetry potential energy on the balance energy is emphasized. It is found that the balance energy of free neutrons is sensitive to the nuclear symmetry energy, while that of free protons is not. Particularly, the initial neutron/proton ratio dependence of the balance energy of free neutrons from Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy.
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