Isospin dependence of radial flow in heavy-ion collisions at intermediate energies

Within the framework of an isospin-dependent quantum molecular dynamics model, the radial flows from the central collisions of 124Ba + 124Ba and 124Sn + 124Sn are studied at different incident energies. It is found that the more neutron-rich system exhibits smaller radial flow and it is shown that the radial flow is sensitive to the nucleon-nucleon cross sections and independent of the nuclear symmetry energy. It suggests that the experimental measurement of the radial flow for reaction systems with different ratios of neutron to proton provide a novel recipe for determining the isospin dependent in-medium nucleon-nucleon cross sections.