Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (4): 235-239 doi: 10.13538/j.1001-8042/nst.22.235-239

• NUCLEAR, HEAVY ION AND ATOMIC PHYSICS • Previous Articles     Next Articles

Shear viscosity to entropy density ratio in BUU transport model

LI Shaoxin1,2 FANG Deqing1,MA Yugang1,ZHOU Chenglong1,2   

  1. 1Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China 2Graduate School of Chinese Academy of Sciences,Beijing 100080,China
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LI Shaoxin, FANG Deqing, MA Yugang, ZHOU Chenglong. Shear viscosity to entropy density ratio in BUU transport model.Nuclear Science and Techniques, 2011, 22(4): 235-239     doi: 10.13538/j.1001-8042/nst.22.235-239


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.

Key words: BUU model, Liquid-gas phase transition, Shear viscosity, Entropy density, η/S