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

N. Bastid, A. Buta, P. Crochet, P. Dupieux, M. Petrovici, F. Rami, J. P. Alard, V. Amouroux, Z. Basrak, I. Belyaev, D. Best, J. Biegansky, T. Blaich, R. Čaplar, C. Cerruti, N. Cindro, J. P. Coffin, R. Donà, M. Dželalija, E. EröZ. G. Fan, P. Fintz, Z. Fodor, L. Fraysse, R. P. Freifelder, A. Gobbi, G. Guillaume, N. Herrmann, K. D. Hildenbrand, S. Hölbling, B. Hong, S. C. Jeong, F. Jundt, J. Keczkemeti, M. Kirejczyk, P. Koncz, Y. Korchagin, R. Kotte, M. Krämer, C. Kuhn, A. Lebedev, I. Legrand, Y. Leifels, C. Maazouzi, V. Manko, G. Mgebrishvili, D. Moisa, J. Mösner, W. Neubert, D. Pelte, C. Pinkenburg, P. Pras, W. Reisdorf, J. L. Ritman, C. Roy, A. G. Sadchikov, D. Schüll, Z. Seres, B. Sikora, V. Simion, K. Siwek-Wilczynska, V. Smolyankin, U. Sodan, K. M. Teh, L. Tizniti, M. Trzaska, M. Vasiliev, P. Wagner, G. S. Wang, J. P. Wessels, T. Wienold, K. Wisniewski, D. Wohlfarth, A. Zhilin

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)573-592
Number of pages20
JournalNuclear Physics A
Volume622
Issue number4
DOIs
Publication statusPublished - 1997 Sep 8
Externally publishedYes

Keywords

  • Measured fragment azimuthal anisotropy vs collision centrality, fragment charge, transverse momentum, incident energy
  • Nuclear reactions Au (Au,X), E = 100-800 MeV/nucleon

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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