Nuclear Science and Techniques

NUCLEAR, HEAVY ION AND ATOMIC PHYSICS

Shear viscosity to entropy density ratio in BUU transport model

LI Shaoxin，

FANG Deqing ，

MA Yugang ，

ZHOU Chenglong

Nuclear Science and Techniques

Vol.22, No.4

pp.235-239

Published in print 20 Aug 2011

DOI：10.13538/j.1001-8042/nst.22.235-239

6400

Shear viscosity (η) is a basic transport coefficient of the medium. In this work, we calculate shear viscosity to entropy density ratio (η/S) of an equilibrated system in intermediate energy heavy ion collisions within the framework of the Boltzmann-Uehling-Uhlenbeck model (BUU) model. After the equilibration of Au + Au system at central collision in a fixed volume is reached, temperature, pressure and energy density are extracted by the phase space information and then η/S is calculated using the Green-Kubo formulas. The results show that η/S drops with the incident energy and its value is not so drastically different from the RHIC results.

BUU modelLiquid-gas phase transitionShear viscosityEntropy densityη/S

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