Abstract
Transverse emission of preequilibrium nucleons, light clusters (complex particles) and charged pions from the isotopic Sn112,124+Sn112,124 reactions at a beam energy of 400 A MeV, to extract the high-density behavior of nuclear symmetry energy, are investigated within an isospin and momentum-dependent transport model. Specifically, the double ratios of neutron/proton, triton/helium-3 and π−/π+ in the squeeze-out domain are analyzed systematically, which are favorable in reducing the influence of the Coulomb force and less systematic errors. It is found that the transverse momentum distribution of isospin ratios strongly depend on the stiffness of nuclear symmetry energy, which would be a nice observable to extract the high-density symmetry energy. The collision centrality and the mass splitting of neutron and proton in nuclear medium play a significant role on the distribution structure of the ratios, but do not change the influence of symmetry energy on the spectrum.
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