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The specific viscosity of neutron-rich nuclear matter is studied from therelaxation time approach using an isospin- and momentum-dependent interactionand the nucleon-nucleon cross sections taken as those from the experimentaldata modified by the in-medium effective masses as used in the IBUU transportmodel calculations. The relaxation time of neutrons is larger while that ofprotons is smaller in neutron-rich nuclear matter compared with that insymmetric nuclear matter, and this leads to a larger specific viscosity inneutron-rich nuclear matter. In addition, the specific viscosity decreases withincreasing temperature because of more frequent collisions and weaker Pauliblocking effect at higher temperatures. At lower temperatures the specificviscosity increases with increasing density due to the Pauli blocking effect,while at higher temperatures it slightly decreases with increasing density as aresult of smaller in-medium effective masses at higher densities.

Specific viscosity of neutron-rich nuclear matter from a relaxation time approach