EPJ Web of Conferences (Mar 2014)

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

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

DOI
https://doi.org/10.1051/epjconf/20146603074
Journal volume & issue
Vol. 66
p. 03074

Abstract

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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