Finding a Probe for Extracting Information on the Momentum Dependent-Interaction in Heavy Ion Collisions

The effect of momentum-dependent interaction on the kinetic energy spectrum of the neutron-proton ratio < (n/p)_gas^>b(E_k) for ⁶⁴Zn+⁶⁴Zn is studied. It is found that < (n/p)_gas>_b(E_k) sensitively depends on the momentum-dependent interaction and weakly on the in-medium nucleon-nucleon cross section and symmetry potential. Therefore<(n/p)_gas>_b(E_k) is a possible probe for extracting information on the momentum-dependent interaction in heavy ion collisions.