Speaker
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\noindent{\underline{The 12th International Conference on Nucleus-Nucleus Collisions, June 21-26, 2015, Catania, Italy}}
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{\large \bf The ASY-EOS experiment at GSI: investigating symmetry energy at supra-saturation densities }
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% insert the authors here. The presenter is underlined
%\underline{A. AAAA}$^1$, B. BBBB$^{1,2}$
\underline{P.~Russotto$^{1}$}, M.~Chartier$^{2}$, M.D.~Cozma$^{3}$, E.~De~Filippo$^{1}$, A.~Le~F`evre$^{4}$, S.~Gannon$^{2}$, I.~Ga\v{s}pari\'c$^{5,6}$, M.~Ki\v{s}$^{4,5}$, S.~Kupny$^{7}$, Y.~Leifels$^{4}$, R.C.~Lemmon$^{8}$, Q.~Li$^{9}$, J.~{\L}ukasik$^{10}$, P.~Marini$^{11,12}$, P.~Paw{\l}owski$^{10}$, W.~Trautmann$^{4}$, L.~Acosta$^{13}$, M.~Adamczyk$^{7}$, A.~Al-Ajlan$^{14}$, M.~Al-Garawi$^{15}$, S.~Al-Homaidhi$^{14}$, F.~Amorini$^{13}$, L.~Auditore$^{16,17}$, T.~Aumann$^{6}$, Y.~Ayyad$^{18}$, V.~Baran$^{13,19}$,
Z.~Basrak$^{5}$,
R.~Bassini$^{20}$,
J.~Benlliure$^{18}$,
C.~Boiano$^{20}$,
M.~Boisjoli$^{12}$,
K.~Boretzky$^{4}$,
J.~Brzychczyk$^{7}$,
A.~Budzanowski$^{10}$,
G.~Cardella$^{1}$,
P.~Cammarata$^{21}$,
Z.~Chajecki$^{22}$,
A.~Chbihi$^{12}$,
M.~Colonna$^{13}$,
B.~Czech$^{10}$,
M.~Di~Toro$^{13,23}$,
M.~Famiano$^{24}$,
V.~Greco$^{13,23}$,
L.~Grassi$^{5}$,
C.~Guazzoni$^{20,25}$,
P.~Guazzoni$^{20,26}$,
M.~Heil$^{4}$,
L.~Heilborn$^{21}$,
R.~Introzzi$^{27}$,
T.~Isobe$^{28}$,
K.~Kezzar$^{15}$,
A.~Krasznahorkay$^{29}$,
N.~Kurz$^{4}$,
E.~La~Guidara$^{1}$,
G.~Lanzalone$^{13,30}$,
P.~Lasko$^{7}$,
I.~Lombardo$^{31,32}$,
W.G.~Lynch$^{22}$,
Z.~Matthews$^{2}$,
L.~May$^{21}$,
T.~Minniti$^{1}$,
M.~Mostazo$^{18}$,
A.~Pagano$^{1}$,
M.~Papa$^{1}$,
S.~Pirrone$^{1}$,
R.~Pleskac$^{4}$,
G.~Politi$^{1,23}$,
F.~Porto$^{13,23}$,
R.~Reifarth$^{4}$,
W.~Reisdorf$^{4}$,
F.~Riccio$^{20,25}$,
F.~Rizzo$^{13,23}$,
E.~Rosato$^{31,32}$,
D.~Rossi$^{4,22}$,
S.~Santoro$^{16,17}$,
H.~Simon$^{4}$
I.~Skwirczynska$^{10}$,
Z.~Sosin$^{7}$,
L.~Stuhl$^{29}$,
A.~Trifir`o$^{16,17}$,
M.~Trimarchi$^{16,17}$,
M.B.~Tsang$^{22}$,
G.~Verde$^{1}$,
M.~Veselsky$^{33}$,
M.~Vigilante$^{31,32}$,
A.~Wieloch$^{7}$,
P.~Wigg$^{2}$,
H.H.~Wolter$^{34}$,
P.~Wu$^{2}$,
S.~Yennello$^{21}$,
P.~Zambon$^{20,25}$,
L.~Zetta$^{20,26}$,
M.~Zoric$^{5}$
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% these are the corresponding institutions
{\em $^{1}$ INFN-Sezione di Catania, Catania, Italy} \
{\em $^{2}$University of Liverpool, Liverpool, UK} \
{\em $^{3}$ IFIN-HH, Magurele-Bucharest, Romania} \
{\em $^{4}$ GSI Helmholtzzentrum, Darmstadt, Germany} \
{\em $^{5}$ Ruder Bo\v{s}kovi`{c} Institute, Zagreb, Croatia} \
{\em $^{6}$ Technische Universit\"at, Darmstadt, Germany} \
{\em $^{7}$ Jagiellonian University, Krak`{o}w, Poland} \
{\em $^{8}$ STFC Laboratory, Daresbury, UK} \
{\em $^{9}$ Huzhou Teachers College, China} \
{\em $^{10}$ IFJ-PAN, Krak`{o}w, Poland} \
{\em $^{11}$ CENBGn Universit\'e de Bordeaux, CNRS/IN2P3, 33175 Gradignan, France} \
{\em $^{12}$ GANIL, Caen, France} \
{\em $^{13}$ INFN-Laboratori Nazionali del Sud, Catania, Italy} \
{\em $^{14}$ KACST Riyadh, Riyadh, Saudi Arabia} \
{\em $^{15}$ King Saud University, Riyadh, Saudi Arabia} \
{\em $^{16}$ INFN-Gruppo Collegato di Messina, Messina, Italy} \
{\em $^{17}$ Universit`a di Messina, Messina, Italy} \
{\em $^{18}$ University of Santiago de Compostela, Santiago de Compostela, Spain} \
{\em $^{19}$ University of Bucharest, Bucharest, Romania} \
{\em $^{20}$ INFN-Sezione di Milano, Milano, Italy} \
{\em $^{21}$ Texas A$\&$M University, College Station, USA} \
{\em $^{22}$ NSCL Michigan State University, East Lansing, USA} \
{\em $^{23}$ Universit`a di Catania, Catania, Italy} \
{\em $^{24}$ Western Michigan University, USA} \
{\em $^{25}$ Politecnico di Milano, Milano, Italy} \
{\em $^{26}$ Universit`a degli Studi di Milano, Milano, Italy} \
{\em $^{27}$ INFN, Politecnico di Torino, Torino, Italy} \
{\em $^{28}$ RIKEN, Wako, Japan} \
{\em $^{29}$ Institute of Nuclear Research, Debrecen, Hungary} \
{\em $^{30}$ Universit`a Kore, Enna, Italy} \
{\em $^{31}$ INFN-Sezione di Napoli, Napoli, Italy } \
{\em $^{32}$ Universit`a di Napoli, Napoli, Italy} \
{\em $^{33}$ Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia} \
{\em $^{34}$ LMU, M\"unchen, Germany} \
%{\em $^1$ AAAA AAAA AAAA} \
%{\em $^2$ BBBB BBBB BBBB}\
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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 is proposed as an observable sensitive to the strength of the symmetry term in the nuclear equation of state at supra-saturation densities. The results obtained from the existing FOPI/LAND data for $^{197}Au+^{197}Au$ collisions at 400 MeV/nucleon in comparison with the UrQMD model favour a moderately soft symmetry term but suffer from a considerable statistical uncertainty [1]. These results have been confirmed by an independent analysis based on T\"{u}bingen QMD [2]. 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 [3]. The flows of neutrons and light charged particles were measured for $^{197}Au+^{197}Au$, $^{96}Ru+^{96}Ru$, and $^{96}Zr+^{96}Zr$ collisions at 400 MeV/nucleon using the Large Area Neutron detector LAND, four double-rings of the forward part of the CHIMERA multi-detector, the ALADIN ToF-Wall, the KRATTA Si-CsI triple-telescope array and the Microball detectors. First results, including comparison of elliptic flow ratios with UrQMD calculations for Au+Au system, will be reported.
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%[1] A. AAAA \emph{et al.}, Phys. Rev. Lett. {\bf 1}, 1 (2015)
[1] P. Russotto \emph{et al.}, Phys. Lett. {\bf B 697} (2011) 471.
[2] M.D. Cozma, Phys. Lett. {\bf B 700}, 139 (2011); M.D. Cozma \emph{et al.}, Phys. Rev. {\bf C} 88, 044912 (2013).
[3] P. Russotto \emph{et al.}, Eur. Phy. J {\bf A 50}, 38 (2014).
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