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Agakishiev, Geydar ; Álvarez-Pol, Héctor ; Balanda, Andrzej ; Bassini, Roberto ; Böhmer, Michael ; Bokemeyer, Helmut ; Boyard, Jean-Louis ; Cabanelas Eiras, Pablo ; Chernenko, Sergey ; Christ, Tassilo ; Destefanis, Marco Giovanni Maria ; Dohrmann, Frank ; Dybczak, Adrian ; Eberl, Thomas ; Fabbietti, Laura ; Fateev, Oleg ; Finocchiaro, Paolo ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Gilardi, Camilla ; Golubeva, Marina ; González-Díaz, Diégo ; Guber, Fedor ; Gumberidze, Malgorzata ; Hennino, Thierry ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Iori, Ileana ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Kanaki, Kalliopi ; Karavicheva, Tatiana ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Kotte, Roland ; Kozuch, Anna ; Krizek, Filip ; Kühn, Wolfgang ; Kugler, Andrej ; Kurepin, Alexei ; Lang, Simon Martin ; Lapidus, Kirill ; Liu, T. ; Maier, Ludwig W. ; Markert, Jochen ; Metag, Volker ; Michalska, Beata ; Morinière, Emilie ; Mousa, Jehad ; Münch, Mathias ; Münch, Christian ; Naumann, Lothar ; Otwinowski, Jacek Tomasz ; Pachmayer, Yvonne C. ; Pechenov, Vladimir ; Pechenova, Olga ; Pérez Cavalcanti, Tiago ; Pietraszko, Jerzy ; Pospısil, Vladimir ; Przygoda, Witold ; Ramstein, Béatrice ; Reshetin, Andrey ; Roy-Stephan, M. ; Rustamov, Anar ; Sadovsky, Alexander ; Sailer, Benjamin ; Salabura, Piotr ; Sánchez, M. ; Schmah, Alexander ; Schwab, Erwin ; Sobolev, Yuri G. ; Spataro, Stefano ; Spruck, Björn ; Ströbele, Herbert ; Stroth, Joachim ; Sturm, Christian Thomas ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Toia, Alberica ; Traxler, Michael ; Trebacz, Radoslaw ; Tsertos, Haralabos ; Wagner, Vladimir ; Wisniowski, Marcin ; Wojcik, Tomasz ; Wüstenfeld, Jörn ; Yurevich, Sergey ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
We present measurements of exclusive ensuremathπ+,0 and η production in pp reactions at 1.25GeV and 2.2GeV beam kinetic energy in hadron and dielectron channels. In the case of π+ and π0 , high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Δ (1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp → pp η , since controversial data exist at 2.0GeV; we find \ensuremathσ=0.142±0.022 mb. Using the dielectron channels, the π0 and η Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.
Russotto, Paolo ; Chartier, Marielle ; Cozma, Mircea Dan ; De Filippo, Enrico ; Le Fèvre, Arnaud ; Gannon, S. ; Gašparić, Igor ; Kis, M. ; Kupny, S. ; Leifels, Yvonne ; Lemmon, Roy Crawford ; Li, Q. ; Lukasik, J. ; Marini, P. ; Pawlowski, P. ; Trautmann, Wolfgang ; Acosta, L. ; Adamczyk, M. ; Al-Ajlan, A. ; Al-Garawi, M. ; Al-Homaidhi, S. ; Amorini, Francesca ; Auditore, Lucrezia ; Aumann, Thomas ; Ayyad, Y. ; Baran, V. ; Basrak, Z. ; Bassini, R. ; Benlliure Anaya, Jose Fernando ; Boiano, Ciro ; Boisjoli, M. ; Boretzky, Konstanze ; Brzychczyk, Janusz ; Budzanowski, Andrzej ; Cardella, Giuseppe ; Chajecki, Zbigniew ; Chbihi, A. ; Colonna, Maria ; Czech, Bronislaw ; Di Toro, Massimo ; Famiano, Michael A. ; Greco, V. ; Grassi, L. ; Guazzoni, Chiara ; Guazzoni, P. ; Heil, Michael ; Heilborn, L. ; Introzzi, Riccardo ; Isobe, Tadaaki ; Kezzar, K. ; Krasznahorkay, Attila ; Kurz, Nikolaus ; La Guidara, E. ; Lanzalone, Gaetano ; Lasko, P. ; Lombardo, Ivano ; Lynch, William G. ; Matthews, Z. ; May, L. ; Minniti, T. ; Mostazo, M. ; Pagano, A. ; Papa, M. ; Pirrone, Sara ; Pleskac, Radek ; Politi, Giuseppe ; Porto, Francesco ; Reifarth, René ; Reisdorf, Willibrord ; Riccio, F. ; Rizzo, Francesca ; Rosato, E. ; Rossi, Dominic M. ; Santoro, S. ; Simon, Haik ; Skwirczynska, I. ; Sosin, Zbigniew ; Stuhl, László ; Trifirò, Antonio ; Trimarchi, Marina ; Tsang, M. Betty ; Verde, Giuseppe ; Veselsky, M. ; Vigilante, Mariano ; Wieloch, A. ; Wigg, P. ; Wolter, Hermann ; Wu, P. ; Yennello, Sherry J. ; Zambon, P. ; Zetta, L. ; Zoric, Maja
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 collisions at 400 MeV/nucleon. 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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