https://doi.org/10.1051/epjconf/20146603074
The ASY-EOS experiment at GSI: investigating symmetry energy at supra-saturation densities
1 INFN-Sezione di Catania, Catania, Italy
2 University of Liverpool, Liverpool, UK
3 IFIN-HH, Magurele-Bucharest, Romania
4 GSI Helmholtzzentrum, Darmstadt, Germany
5 Ruder Boškovi`c Institute, Zagreb, Croatia
6 Technische Universität, Darmstadt, Germany
7 Jagiellonian University, Krakòw, Poland
8 STFC Laboratory, Daresbury, UK
9 Huzhou Teachers College, China
10 IFJ-PAN, Krakow, Poland
11 Texas A&M University, College Station, USA
12 GANIL, Caen, France
13 INFN-Gruppo Collegato di Messina, Messina, Italy
14 Università di Messina, Messina, Italy
15 Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
16 INFN-Laboratori Nazionali del Sud, Catania, Italy
17 KACST Riyadh, Riyadh, Saudi Arabia
18 King Saud University, Riyadh, Saudi Arabia
19 University of Santiago de Compostela, Santiago de Compostela, Spain
20 University of Bucharest, Bucharest, Romania
21 INFN-Sezione di Milano, Milano, Italy
22 NSCL Michigan State University, East Lansing, USA
23 Università di Catania, Catania, Italy
24 Western Michigan University, USA
25 Politecnico di Milano, Milano, Italy
26 Università degli Studi di Milano, Milano, Italy
27 INFN, Politecnico di Torino, Torino, Italy
28 RIKEN, Wako, Japan
29 Institute of Nuclear Research, Debrecen, Hungary
30 Università Kore, Enna, Italy
31 INFN-Sezione di Napoli, Napoli, Italy
32 Università di Napoli, Napoli, Italy
33 LMU, München, Germany
a e-mail: russotto@lns.infn.it
Published online: 20 March 2014
The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy-ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. The results obtained from the existing FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon in comparison with the UrQMD model simulations favoured a moderately soft symmetry term, but suffer from a considerable statistical uncertainty. These results have been confirmed by an independent analysis based on the Tübingen QMD simulations. 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. The present status of the data analysis is reported
© Owned by the authors, published by EDP Sciences, 2014
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