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

Russotto, P. and Chartier, M. and Filippo, E. D. and Fèvre, A. L. and Gannon, S. and Gaparić, I. and Ki, M. and Kupny, S. and Leifels, Y. and Lemmon, R. C. and Ukasik, J. and Marini, P. and Pagano, A. and Pawowski, P. and Santoro, S. and Trautmann, W. and Veselsky, M. and Acosta, L. and Adamczyk, M and Al-Ajlan, A. and Al-Garawi, M. and Al-Homaidhi, S. and Amorini, F. and Auditore, L. and Aumann, T. and Ayyad, Y. and Baran, V. and Basrak, Z. and Benlliure, J. and Boiano, C. and Krasznahorkay, Attila and Stuhl, László (2013) The ASY-EOS experiment at GSI: Investigating the symmetry energy at supra-saturation densities. JOURNAL OF PHYSICS-CONFERENCE SERIES, 420 (1). ISSN 1742-6588

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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 197Au+197Au 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.

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