Mean free path and shear viscosity in central $^{129}\mathrm{Xe}+^{119}\mathrm{Sn}$ collisions below 100 MeV/nucleon

H.L. Liu , Y.G. Ma , A. Bonasera , X.G. Deng , O. Lopez (1) , M. Veselský

1 LPCC - Laboratoire de physique corpusculaire de Caen

Thermal and transport properties of hot nuclear matter formed in central Xe129+Sn119 collisions at the Fermi energy are investigated using the isospin-dependent quantum molecular dynamical model. Temperature (T), average density (ρ), chemical potential (μ), mean momentum (P), shear viscosity (η), and entropy density (s) are obtained from the phase-space information. The mean free path (λnn) and the in-medium nucleon-nucleon cross section (σnn) in the highest compressible stage at different incident energies are deduced and compared with the experimental results from Phys. Rev. C 90, 064602 (2014)PRVCAN0556-281310.1103/PhysRevC.90.064602. The result shows that λnn and σnn have the same trend and similar values as the experimental results when the beam energy is greater than 40 MeV/nucleon at maximum compressed state. Furthermore, the derived shear viscosity over entropy density (η/s) shows a decreasing behavior to a saturated value around 34π as a function of incident energy.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

H.L. Liu, Y.G. Ma, A. Bonasera, X.G. Deng, O. Lopez, et al.. Mean free path and shear viscosity in central $^{129}\mathrm{Xe}+^{119}\mathrm{Sn}$ collisions below 100 MeV/nucleon. Phys.Rev.C, 2017, 96 (6), pp.064604. ⟨10.1103/PhysRevC.96.064604⟩. ⟨hal-01669688⟩