The ASY-EOS experiment at GSI: investigating the symmetry energy at supra-saturation densities

Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich heavy-ions systems at intermediate energies has been proposed as an observable sensitive to the strength of the symmetry term in the nuclear Equation Of State (EOS) at supra-saturation densities. The recent results obtained from the existing FOPI/LAND data for ${}^{197}$Au+${}^{197}$Au collisions at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate of the symmetry term of the EOS but suffer from a considerable statistical uncertainty. In order to obtain an improved data set for Au+Au collisions and to extend the study to other systems, a new experiment was carried out at the GSI laboratory by the ASY-EOS collaboration in May 2011.

Talk given by P. Russotto at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)

References in corpus (13)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• The Giant Dipole Resonance as a quantitative constraint on the symmetry energy
• Isotopic dependence of the giant monopole resonance in the even-A ^{112-124}Sn isotopes and the asymmetry term in nuclear incompressibility
• Symmetry energy from elliptic flow in 197Au + 197Au
• Neutron and Proton Transverse Emission Ratio Measurements and the Density Dependence of the Asymmetry Term of the Nuclear Equation of State
• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• Isospin effects on sub-threshold kaon production at intermediate energies
• Systematics of Stopping and Flow in Au+Au Collisions
• Isospin dependent multifragmentation of relativistic projectiles
• Isospin Dependence of Incomplete Fusion Reactions at 25 Mev/a
• Double neutron-proton differential transverse flow as a probe for the high-density behavior of the nuclear symmetry energy
• Probing the symmetry energy and the degree of isospin equilibrium
• The symmetry energy in nuclear reactions

Cited by in corpus (7)

• Equations of state for supernovae and compact stars
• Towards a model-independent constraint of the high-density dependence of the symmetry energy
• Constraining the high-density nuclear symmetry energy with the transverse-momentum dependent elliptic flow
• Collective flows of light particles in the Au+Au collision at intermediate energies
• Effects of the liquid-gas phase transition and cluster formation on the symmetry energy
• Probing nuclear symmetry energy at high densities using pion, kaon, eta and photon productions in heavy-ion collisions
• Flow probe of symmetry energy in relativistic heavy-ion reactions