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

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.; Caplar, R.; Cerruti, C.; Cindro, N.; Coffin, J. P.; Dona, R.; Dzelalija, 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, Roland; 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.

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

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.; Caplar, R.; Cerruti, C.; Cindro, N.; Coffin, J. P.; Dona, R.; Dzelalija, 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.

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.

Keywords: NUCLEAR REACTIONS Au (Au,X); measured fragment azimuthal anisotropy vs collision centrality; deduced in-plane to out-of-plane emission transition signature; incident energy; transverse momentum; fragment charge; E = 100-800 MeV/nucleon

Nuclear Physics A 622(4) (1997) 573-592

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