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. 
Yuan Gao, Lei Zhang, Hong-Fei Zhang, Xi-Meng Chen, Gao-Chan Yong
nucl-th astro-ph.CO nucl-ex