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

P. Russotto , M. Chartier , M.D. Cozma , E. De Filippo , A. Le Fèvre , S. Gannon , I. Gasparic , M. Kis , S. Kupny , Y. Leifels , R.C. Lemmo , Q. Li , J. Lukasik , P. Marini (1, 2) , P. Pawlowski , W. Trautmann , 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 (2) , K. Boretzky , J. Brzychczyk , A. Budzanowski , G. Cardella , P. Cammarata , Z. Chajecki , A. Chbihi (2) , 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 , S. Santoro , H. Simon I. Skwirczynska , Z. Sosin , L. Stuhl , A. Trifiro , M. Trimarchi , M.B. Tsang , G. Verde , M. Veselsk , M. Vigilante , A. Wieloch , P. Wigg , H.H. Wolter , P. Wu , S. Yennello , P. Zambon , L. Zetta , M. Zoric

1 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 GANIL - Grand Accélérateur National d'Ions Lourds

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. In the ASY-EOS experiment at the GSI laboratory, flows of neutrons and light charged particles were measured for 197Au+197Au, 96Zr+96Zr and 96Ru+96Ru collisions at 400 MeV/nucleon with the Large Area Neutron Detector LAND as part of a setup with several additional detection systems used for the event characterization. Flow results obtained for the Au+Au system, in comparison with predictions of the UrQMD transport model, confirm the moderately soft to linear density dependence of the symmetry energy deduced from the earlier FOPI-LAND data.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

P. Russotto, M. Chartier, M.D. Cozma, E. De Filippo, A. Le Fèvre, et al.. The ASY-EOS experiment at GSI: Constraining the symmetry energy at supra-saturation densities. International Workshop on Multi facets of Eos and Clustering (IWM-EC 2014), May 2014, Catania, Italy. pp.00022, ⟨10.1051/epjconf/20158800022⟩. ⟨in2p3-01168718⟩