Momentum-Dependent Symmetry Potential from Nuclear Collective Flows in Heavy Ion Collisions at Intermediate Energies

Within the isospin-dependent quantum molecular dynamics model, we investigate the nuclear collective flows produced in semi-central (Au+197Au)-Au-197 collisions at intermediate energies. The neutron-proton differential flows and difference of neutron-proton collective flows are sensitive to the momentum-dependent symmetry potential. This sensitivity is less affected by both the isoscalar part of nuclear equation of state and in-medium nucleon-nucleon cross sections. Moreover, this sensitivity becomes pronounced with increasing the rapidity cut.