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

P. Russotto; M. Chartier; M.D. Cozma; E. De Filippo; A. Le Fèvre; S. Gannon; I. Gašparić; M. Kiš; S. Kupny; Y. Leifels; R.C. Lemmon; Q. Li; J. Łukasik; P. Marini; P. Pawłowski; S. Santoro; W. Trautmann; M. Veselsky; L. Acosta; M. Adamczyk; A. Al-Ajlan; M. Al-Garawi; S. Al-Homaidhi; F. Amorini; L. Auditore; T. Aumann; Y. Ayyad; V. Baran; Z. Basrak; R. Bassini; J. Benlliure; C. Boiano; M. Boisjoli; K. Boretzky; J. Brzychczyk; A. Budzanowski; G. Cardella; P. Cammarata; Z. Chajecki; A. Chbihi; M. Colonna; B. Czech; M. Di Toro; M. Famiano; V. Greco; L. Grassi; C. Guazzoni; P. Guazzoni; M. Heil; L. Heilborn; R. Introzzi; T. Isobe; K. Kezzar; A. Krasznahorkay; N. Kurz; E. La Guidara; G. Lanzalone; P. Lasko; I. Lombardo; W.G. Lynch; Z. Matthews; L. May; T. Minniti; M. Mostazo; A. Pagano; M. Papa; S. Pirrone; R. Pleskac; G. Politi; F. Porto; R. Reifarth; W. Reisdorf; F. Riccio; F. Rizzo; E. Rosato; D. Rossi; H. Simon; I. Skwirczynska; Z. Sosin; L. Stuhl; A. Trifirò; M. Trimarchi; M.B. Tsang; G. Verde; M. Vigilante; A. Wieloch; P. Wigg; H.H. Wolter; P. Wu; S. Yennello; P. Zambon; L. Zetta; M. Zoric

doi:10.1051/epjconf/20146603074

Proceedings

Open Access

EPJ Web of Conferences 66, 03074 (2014)
https://doi.org/10.1051/epjconf/20146603074

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

P. Russotto¹^a, M. Chartier², M.D. Cozma³, E. De Filippo¹, A. Le Fèvre⁴, S. Gannon², I. Gašparić⁵^,6, M. Kiš⁴^,5, S. Kupny⁷, Y. Leifels⁴, R.C. Lemmon⁸, Q. Li⁹, J. Łukasik¹⁰, P. Marini¹¹^,12, P. Pawłowski¹⁰, S. Santoro¹³^,14, W. Trautmann⁴, M. Veselsky¹⁵, L. Acosta¹⁶, M. Adamczyk⁷, A. Al-Ajlan¹⁷, M. Al-Garawi¹⁸, S. Al-Homaidhi¹⁷, F. Amorini¹⁶, L. Auditore¹³^,14, T. Aumann⁶, Y. Ayyad¹⁹, V. Baran¹⁶^,20, Z. Basrak⁵, R. Bassini²¹, J. Benlliure¹⁹, C. Boiano²¹, M. Boisjoli¹², K. Boretzky⁴, J. Brzychczyk⁷, A. Budzanowski¹⁰, G. Cardella¹, P. Cammarata¹¹, Z. Chajecki²², A. Chbihi¹², M. Colonna¹⁶, B. Czech¹⁰, M. Di Toro¹⁶^,23, M. Famiano²⁴, V. Greco¹⁶^,23, L. Grassi⁵, C. Guazzoni²¹^,25, P. Guazzoni²¹^,26, M. Heil⁴, L. Heilborn¹¹, R. Introzzi²⁷, T. Isobe²⁸, K. Kezzar¹⁸, A. Krasznahorkay²⁹, N. Kurz⁴, E. La Guidara¹, G. Lanzalone¹⁶^,30, P. Lasko⁷, I. Lombardo³¹^,32, W.G. Lynch²², Z. Matthews³, L. May¹¹, T. Minniti¹³^,14, M. Mostazo¹⁹, A. Pagano¹, M. Papa¹, S. Pirrone¹, R. Pleskac⁴, G. Politi¹^,23, F. Porto¹⁶^,23, R. Reifarth⁴, W. Reisdorf⁴, F. Riccio²¹^,25, F. Rizzo¹⁶^,23, E. Rosato³¹^,32, D. Rossi⁴^,22, H. Simon⁴, I. Skwirczynska¹⁰, Z. Sosin⁷, L. Stuhl²⁹, A. Trifirò¹³^,14, M. Trimarchi¹³^,14, M.B. Tsang²², G. Verde¹, M. Vigilante³¹^,32, A. Wieloch⁷, P. Wigg², H.H. Wolter³³, P. Wu², S. Yennello¹¹, P. Zambon²¹^,25, L. Zetta²¹^,26 and M. Zoric⁵

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

Abstract

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

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