Elliptic flow in heavy ion collisions near the balance energy

Abstract

The proton elliptic flow in collisions of Ca on Ca at energies from 30 to 100 MeV/nucleon is studied in an isospin-dependent transport model. With increasing incident energy, the elliptic flow shows a transition from positive to negative flow. Its magnitude depends on both the nuclear equation of state (EOS) and the nucleon-nucleon scattering cross section. Different elliptic flows are obtained for a stiff EOS with free nucleon-nucleon cross sections and a soft EOS with reduced nucleon-nucleon cross sections, although both lead to vanishing in-plane transverse flow at the same balance energy. The study of both in-plane and elliptic flows at intermediate energies thus provides a means to extract simultaneously the information on the nuclear equation of state and the nucleon-nucleon scattering cross section in medium.

6 pages, 2 figures

References in corpus (5)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• Elliptic flow from a parton cascade
• Differential flow in heavy-ion collisions at balance energies
• Excitation function of nucleon and pion elliptic flow in relativistic heavy-ion collisions
• Kaon differential flow in relativistic heavy-ion collisions

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• Experimental balance energies and isospin-dependent nucleon-nucleon cross-sections
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• Impact parameter dependence of the scaling of anisotropic flows in intermediate energy HIC
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