Effect of the momentum dependence of nuclear symmetry potential on
  pion-/pion+ ratio in heavy-ion collisions
  In the framework of the isospin-dependent Boltzmann-Uehling-Uhlenbeck
transport model, effect of the momentum dependence of nuclear symmetry
potential on pion-/pion+ ratio in the neutron-rich reaction 132Sn+124Sn at a
beam energy of 400 MeV/nucleon is studied. We find that the momentum dependence
of nuclear symmetry potential affects the compressed density of colliding
nuclei, numbers of produced pion- and pion+, as well as the value of
pion-/pion+ ratio. The momentum dependent nuclear symmetry potential increases
the compressed density of colliding nuclei, numbers of produced resonances
delta(1232), N*(1440), pion- and pion+, as well as the value of pion-/pion+
ratio.
