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We investigate the effects of baryon chemical potential \mu on the shearviscosity coefficient \eta and the viscosity to entropy density ratio \eta/s ofa pion-nucleon gas mixture. We find that \eta is an increasing function of Tand \mu, while the ratio \eta/s turns to a decreasing function in a wide regionof T-\mu plane. In the kinematical region we studied, the smallest value of\eta/s is about 0.3.

Shear viscosity of hadronic gas mixtures