Out-of-plane emission of nuclear matter in Au+Au collisions between 100 and 800 AMeV

• Published in: Nuclear physics. A 1997-09, Vol.622 (4), p.573-592
• Main Authors: Bastid, N., Buta, A., Crochet, P., Dupieux, P., Petrovici, M., Rami, F., Alard, J.P., Amouroux, V., Basrak, Z., Belyaev, I., Best, D., Biegansky, J., Blaich, T., Čaplar, R., Cerruti, C., Cindro, N., Coffin, J.P., Donà, R., Dželalija, M., Erö, E., Fan, Z.G., Fintz, P., Fodor, Z., Fraysse, L., Freifelder, R.P., Gobbi, A., Guillaume, G., Herrmann, N., Hildenbrand, K.D., Hölbling, S., Hong, B., Jeong, S.C., Jundt, F., Keczkemeti, J., Kirejczyk, M., Koncz, P., Korchagin, Y., Kotte, R., Krämer, M., Kuhn, C., Lebedev, A., Legrand, I., Leifels, Y., Maazouzi, C., Manko, V., Mgebrishvili, G., Moisa, D., Mösner, J., Neubert, W., Pelte, D., Pinkenburg, C., Pras, P., Reisdorf, W., Ritman, J.L., Roy, C., Sadchikov, A.G., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Sodan, U., Teh, K.M., Tizniti, L., Trzaska, M., Vasiliev, M., Wagner, P., Wang, G.S., Wessels, J.P., Wienold, T., Wisniewski, K., Wohlfarth, D., Zhilin, A.
• Format: Article
• Language: English
• Subjects: Nuclear Reactions
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(97)80700-2

We present new experimental results concerning the azimuthal distributions of proton-likes, light and intermediate mass fragments at midrapidity for Au(100–800 A MeV) +Au collisions measured with the FOPI phase-I detector at GSI in Darmstadt. The azimuthal distributions are investigated as a function of the collision centrality, the incident energy, the fragment charge and transverse momentum. The azimuthal anisotropy is maximum for impact parameters around 7 fm. Intermediate mass fragments present a stronger out-of-plane emission signal than light fragments and a saturation is reached for Z ⩾ 4. The azimuthal anisotropy increases with the fragment transverse momentum and decreases as the incident energy increases. The azimuthal anisotropy of Z = 2 particles investigated as a function of the scaled fragment transverse momentum follows an universal curve for bombarding energies between 250–800 A MeV. A signature for a transition from in-plane to out-of-plane emission is evidenced at the lowest beam energies.