Influence of a momentum dependent interaction on the isospin dependence of fragmentation and dissipation in intermediate energy heavy ion collisions

We studied the influence of a momentum dependent interaction in the context of isospin effects on fragmentation and dissipation in intermediate energy heavy ion collisions by using an isospin dependent quantum molecular dynamics model. It is shown that nuclear stopping, the number of nucleons emitted, and the multiplicity of intermediate mass fragments are larger with a momentum dependent interaction than without. In particular, the differences for these observables, when using an isospin dependent in-medium nucleon-nucleon cross section versus an isospin independent one, are also larger at high energies for a momentum dependent interaction than without one. Therefore, momentum dependence enhances the sensitivities of those observables to the isospin effect of the in-medium nucleon-nucleon cross section towards high beam energies.