Ratio of shear viscosity to entropy density in multifragmentation of Au + Au

) for the intermediate energy heavy-ion collisions has been calculated by using the Green-Kubo method in the framework of the quantum molecular dynamics model. The theoretical curve of

\eta/s

as a function of the incident energy for the head-on Au+Au collisions displays that a minimum region of

\eta/s

has been approached at higher incident energies, where the minimum

\eta/s

value is about 7 times Kovtun-Son- Starinets (KSS) bound (1/4

\pi

). We argue that the onset of minimum

\eta/s

region at higher incident energies corresponds to the nuclear liquid gas phase transition in nuclear multifragmentation.

Note:

6 pages, 8 figures

66.20.-d
25.70.-z
entropy: density
liquid: gas
heavy ion: scattering
viscosity
quantum molecular dynamics
critical phenomena
gold
ratio: energy dependence

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