Proton, deuteron and triton flow measurements in Au plus Au collisions at root s(NN)=2.4 GeV

J. Adamczewski-Musch, O. Arnold, C. Behnke, A. Belounnas, J. C. Berger-Chen,A. Blanco, C. Blume,M. Boehmer, P. Bordalo, L. Chlad,I. Ciepal, C. Deveaux, J. Dreyer, E. Epple, L. Fabbietti, P. Filip, P. Fonte,C. Franco, J. Friese, I. Froehlich, T. Galatyuk,J. A. Garzon, R. Gernhaeuser, R. Greifenhagen, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, S. Hlavac, C. Hoehne,R. Holzmann, B. Kaempfer, B. Kardan, I. Koenig, W. Koenig, M. Kohls, B. W. Kolb, G. Korcyl, G. Kornakov, F. Kornas, R. Kotte,A. Kugler, T. Kunz, R. Lalik, K. Lapidus,L. Lopes, M. Lorenz, T. Mahmoud, L. Maier, A. Malige, A. Mangiarotti, J. Markert, T. Matulewicz, S. Maurus, V. Metag, J. Michel, D. M. Mihaylov, C. Muentz, R. Muenzer, L. Naumann, K. Nowakowski,Y. Parpottas, V. Pechenov,O. Pechenova,K. Piasecki,J. Pietraszko, W. Przygoda, K. Pysz,S. Ramos, B. Ramstein, N. Rathod, P. Rodriguez-Ramos, P. Rosier, A. Rost, A. Rustamov, P. Salabura, T. Scheib, H. Schuldes, E. Schwab, F. Scozzi, F. Seck, P. Sellheim, I. Selyuzhenkov, J. Siebenson,L. Silva, U. Singh, J. Smyrski,Yu. G. Sobolev, S. Spataro, S. Spies, H. Stroebele,J. Stroth, C. Sturm, O. Svoboda, M. Szala, P. Tlusty, M. Traxler,H. Tsertos, V. Wagner, C. Wendisch, M. G. Wiebusch, J. Wirth, D. Wojcik, P. Zumbruch

EUROPEAN PHYSICAL JOURNAL A(2023)

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摘要
High-precision measurements of flow coefficients v(n) (n = 1 - 4) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at root s(NN) = 2.4 GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at the SIS18/GSI. Flow coefficients are studied as a function of transverse momentum p(t) and rapidity y(cm) over a large region of phase-space and for several classes of collision centrality. A clear mass hierarchy, as expected by relativistic hydrodynamics, is found for the slope of v(1), d(v1)/dy'vertical bar y'=0 where y' is the scaled rapidity, and for v(2) at mid-rapidity. Scaling with the number of nucleons is observed for the p(t) dependence of v(2) and v(4) at mid-rapidity, which is indicative for nuclear coalescence as the main process responsible for light nuclei formation. v(2) is found to scale with the initial eccentricity , while v(4) scales with (2) and (.) The multi-differential high-precision data on v(1), v(2), v(3), and v(4) provides important constraints on the equation-of-state of compressed baryonic matter.
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