ASY-EOS experiment at GSI

¹ INFN-LNS, Catania, Italy
² University of Catania, Italy
³ Jagiellonian University, Kraków, Poland
⁴ KACST, Riyadh, Saudi Arabia
⁵ King Saud University, Riyadh, Saudi Arabia
⁶ INFN, Sezione di Messina, Italy
⁷ University of Messina, Italy
⁸ Technische Universität, Darmstadt, Germany
⁹ University of Santiago de Compostela, Spain
¹⁰ RBI, Zagreb, Croatia
¹¹ INFN, Sezione di Milano, Italy
¹² GANIL, Caen, France
¹³ GSI, Darmstadt, Germany
¹⁴ IFJ-PAN, Krakow, Poland
¹⁵ INFN, Sezione di Catania, Italy
¹⁶ Texas A&M University, College Station, TX, USA
¹⁷ NSCL Michigan State University, MI, USA
¹⁸ University of Liverpool, UK
¹⁹ Western Michigan University, MI, USA
²⁰ Politecnico di Milano, Italy
²¹ University degli Studi di Milano, Italy
²² INFN, Politecnico di Torino, Italy
²³ RIKEN, Wako, Japan
²⁴ Kore University of Enna, Italy
²⁵ STFC Daresbury Laboratory, UK
²⁶ Huzhou Teachers College, China
²⁷ INFN, Sezione di Napoli, Italy
²⁸ University of Napoli, Italy
²⁹ NIPNE, Bucharest, Romania
³⁰ Institute of Physics, Slovak Academy of Sciences Bratislava, Slovakia
³¹ INS, Warsaw, Poland
³² LMU, Mϋunchen, Germany

Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich Heavy-Ion at intermediate energies has been recently 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.