ASY-EOS experiment at GSI

P. Russotto^1,2, L. Acosta¹, M. Adamczyk³, A. Al-Ajlan⁴, M. Al-Garawi⁵, S. Al-Homaidhi⁴, F. Amorini¹, L. Auditore^6,7, T. Aumann⁸, Y. Ayyad⁹, V. Baran^1,29, Z. Basrak¹⁰, J. Benlliure⁹, C. Boiano¹¹, C. Boisjoli¹², K. Boretzky¹³, J. Brzychczyk³, A. Budzanowski¹⁴, G. Cardella¹⁵, P. Cammarata¹⁶, S. Cavallaro^15,2, Z. Chajecki¹⁷, M. Chartier¹⁸, A. Chbihi¹², M. Colonna¹, B. Czech¹⁴, E. De Filippo¹⁵, M. Di Toro^1,2, M. Famiano¹⁹, A. Le Fevre¹³, A. Gašsparić¹⁰, E. Geraci^15,2, L. Grassi¹⁰, V. Greco^1,2, C. Guazzoni^11,20, P. Guazzoni^11,21, M. Heil¹³, L. Heilborn¹⁶, R. Introzzi²², T. Isobe²³, K. Kezzar⁵, M. Kiš^13,10, S. Kupny³, N. Kurz¹³, E. La Guidara¹⁵, G. Lanzalone^1,24, P. Lasko³, Y. Leifels¹³, R. Lemmon²⁵, Q. Li²⁶, I. Lombardo^27,28, D. Loria^6,7, J. Lukasik¹⁴, W.G. Lynch¹⁷, P. Marini¹⁶, Z. Matthews¹⁸, L. May¹⁶, T. Minniti^6,7, M. Mostazo⁹, A. Pagano¹⁵, M. Papa¹⁵, P. Pawlowski¹⁴, M. Petrovici²⁹, S. Pirrone¹⁵, G. Politi^15,5, F. Porto^1,2, R. Reifarth¹³, W. Reisdorf¹³, F. Riccio^11,21, F. Rizzo^1,2, E. Rosato^27,28, D. Rossi¹³, S. Santoro^6,7, H. Simon¹³, I. Skwirczynska¹⁴, Z. Sosin³, W. Trautmann¹³, A. Trifirò^6,7, M. Trimarchi^6,7, B. Tsang¹⁷, M. Veselsky³⁰, G. Verde¹⁵, M. Vigilante^27,28, A. Wieloch³, P. Wigg¹⁸, J. Wilczynski³¹, H.H. Wolter³², P. Wu¹⁸, S. Yennello¹⁶, P. Zambon^11,20, L. Zetta^11,21 and M. Zoric¹⁰

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

Published online: 05 July 2012

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.