Iso-vector dipole resonance and shear viscosity in low energy heavy-ion collision

Abstract

The ratio of shear viscosity over entropy density in low energy heavy-ion collision has been calculated by using the Green-Kubo method in the framework of an extended quantum molecular dynamics model. After the system almost reaching a local equilibration for a head-on ${}^{40}$Ca+${}^{100}$Mo collision, thermodynamic and transport properties are extracted. Meanwhile, iso-vector giant dipole resonance (IVGDR) of the collision system is also studied. By the Gaussian fits to the IVGDR photon spectra, the peak energies of IVGDR are extracted at different incident energies. The result shows that the IVGDR peak energy has a positive correlation with the ratio of shear viscosity over entropy density. This is a quantum effect and indicates a difference between nuclear matter and classical fluid.

arXiv comment7 pages, 8 figures; Physical Review C (in press)

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• Mean free path and shear viscosity in central ${}^{129}$Xe+${}^{119}$Sn collisions below 100 MeV/nucleon
• Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model
• Green-Kubo formula for Boltzmann and Fermi-Dirac statistics
• Isovector giant dipole resonance mode with an improved propagation approach in the framework of EQMD model