The ASY-EOS experiment at GSI: Constraining the 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., Trautmann W., 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., Santoro S., Simon H., Skwirczynska I., Sosin Z., Stuhl L., Trifirò A., Trimarchi M., Tsang M.B., Verde G., Veselsky M., Vigilante M., Wieloch A., Wigg P., Wolter H.H.,Wu P., Yennello S.,Zambon P.,Zetta L., Zoric M.

EPJ Web of Conferences（2015）

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摘要

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.

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