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Energy dependence of collective flow of neutrons and protons in197Au+197Au collisions

  • Heavy Ion Physics
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

Abstract

We investigate the beam energy dependence of neutron and proton squeeze-out in collisions of197Au+197Au atE/A=400—800 MeV. The azimuthal anisotropy that describes the enhanced emission of mid-rapidity neutrons perpendicular to the reaction plane rises strongly with the transverse momentum of the neutrons. This dependence of the azimuthal anisotropy follows a universal curve — independent of beam energy — if the neutron momenta are measured in fractions of the projectile momentum per mass unit. Analogously, the kinetic energy spectra of mid-rapidity neutrons exhibit a universal behaviour as a function of the kinetic energy of the projectile.

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Author information

Author notes

  1. H. Freiesleben

    Present address: Institut für Kern- und Teilchenphysik, Technische Universität Dresden, D-01062, Dresden, Germany

  2. W. Henning

    Present address: Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA

  3. E. F. Moore

    Present address: Department of Physics, North Carolina State University, P.O. Box 8202, 27695-8202, Raleigh, NC, USA

Authors and Affiliations

  1. Institut für Kernchemie, Johannes-Gutenberg-Universität, D-55099, Mainz, Germany

    D. Lambrecht, T. Blaich & J. V. Kratz

  2. Institut für Kernphysik, Johann-Wolfgang-Goethe-Universität, D-60325, Frankfurt, Germany

    T. W. Elze, K. Grimm, C. Schütter, H. Spies & K. Stelzer

  3. Gesellschaft für Schwerionenforschung, Postfach 110552, D-64291, Darmstadt, Germany

    H. Emling, R. Holzmann, H. Klingler, E. F. Moore, R. Schmidt, J. Stroth, M. Zinser & E. Zude

  4. Institut für Experimentalphysik, Ruhr-Universität Bochum, D-44801, Bochum, Germany

    H. Freiesleben, J. G. Keller, S. Lange & Y. Leifels

  5. Institute of Physics, Jagellonian University, PL-30-059, Cracow, Poland

    R. Kulessa, E. Lubkiewicz, W. Prokopowicz, E. Wajda & W. Waluś

Authors
  1. D. Lambrecht
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  2. T. Blaich
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The FOPI-collaboration

Additional information

The members of the FOPI-collaboration: J.P. Alard, Z. Basrak, N. Bastid, I.M. Belayev, M. Bini, R. Bock, A. Buta, R. Čaplar, C. Cerruti, N. Cindro, J.P. Coffin, M. Crouau, P. Dupieux, J. Erö, Z.G. Fan, P. Fintz, Z. Fodor, R. Freifelder, L. Fraysse, S. Frolov, A. Gobbi, Y. Grigorian, G. Guillaume, N. Herrmann, K.D. Hildenbrand, S. Hölbling, O. Houari, S.C. Jeong, M. Jorio, F. Jundt, J. Kecskemeti, P. Koncz, Y. Korchagin, R. Kotte, M. Krämer, C. Kuhn, I. Legrand, A. Lebedev, C. Maguire, V. Manko, T. Matulewicz, G. Mgebrishvili, J. Mösner, D. Moisa, G. Montarou, P. Morel, W. Neubert, A. Olmi, G. Pasquali, D. Pelte, M. Petrovici, G. Poggi, F. Rami, W. Reisdorf, A. Sadchikov, D. Schüll, Z. Seres, B. Sikora, V. Simion, S. Smolyankin, U. Sodan, N. Taccetti, K. Teh, R. Tezkratt, M. Trzaska, M.A. Vasiliev, P. Wagner, J.P. Wessels, T. Wienold, Z. Wilhelmi, D. Wohlfarth, A.V. Zhilin.

We thank the accelerator personnel at GSI for providing an excellent197Au-beam for our experiment. — This work was funded by the German Federal Secretary for Research and Technology (BMFT) under contract numbers 06BO511, 06OF112, and 06MZ106, and by GSI via Hochschulzusammenarbeitsvereinbarungen under contract numbers BO FRE, FELE, and MZKRD. This work was partly supported by the Committee for Scientific Research (Poland) under grant No. PB1158/P3/92.

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Lambrecht, D., Blaich, T., Elze, T.W. et al. Energy dependence of collective flow of neutrons and protons in197Au+197Au collisions. Z. Physik A - Hadrons and Nuclei 350, 115–120 (1994). https://doi.org/10.1007/BF01290679

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