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Shear viscosity to entropy density ratio in nuclear multifragmentation

2010; American Institute of Physics; Volume: 81; Issue: 5 Linguagem: Inglês

10.1103/physrevc.81.051601

1538-4497

Subrata Pal,

Particle physics theoretical and experimental studies

Nuclear multifragmentation in intermediate-energy heavy-ion collisions has long been associated with liquid-gas phase transition. We calculate the shear viscosity to entropy density ratio $\ensuremath{\eta}/s$ for an equilibrated system of nucleons and fragments produced in multifragmentation within an extended statistical multifragmentation model. The temperature dependence of $\ensuremath{\eta}/s$ exhibits behavior surprisingly similar to that of ${\mathrm{H}}_{2}$O. In the coexistence phase of fragments and light particles, the ratio $\ensuremath{\eta}/s$ reaches a minimum of depth comparable to that for water in the vicinity of the critical temperature for liquid-gas phase transition. The effects of freeze-out volume and surface symmetry energy on $\ensuremath{\eta}/s$ in multifragmentation are studied.