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Spectator Nucleons in Pb+Pb Collisions at 158 A·GeV

  • Heavy ion physics
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The composition of forward-going projectile spectator matter in fixed-target Pb+Pb collisions at 158 A · GeV at the CERN SPS has been studied as a function of centrality. The data were measured with the NA49 veto calorimeter. We observe that forward-going spectator matter in central collisions consists of 9 neutrons, 7 protons, and half a deuteron on average. At large impact parameters most spectator nucleons are bound in fragments. The relative resolution of the average impact parameter derived from the measurement of spectator neutrons is roughly 19% in the range from zero to half maximum impact parameters.

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Authors and Affiliations

  1. Department of Physics, University of Athens, Athens, Greece, , , , , , GR

    A.D. Panagiotou, A. Petridis & M. Vassiliou

  2. Lawrence Berkeley National Laboratory, University of California, Berkeley, USA, , , , , , US

    G.E. Cooper, I. Huang, D. Irmscher, P. Jacobs, S. Margetis, G. Odyniec, R.J. Porter, A.M. Poskanzer, H.G. Ritter, H. Rudolph, I. Sakrejda, M. Toy, F. Wang & T. Wienold

  3. Birmingham University, Birmingham, England, , , , , , GB

    L.S. Barnby, R. A. Barton, C.O. Blyth, H.L. Caines, L.A. Hill, P.G. Jones, J.M. Nelson, G.T.A. Squier, T.A. Yates & R. Zybert

  4. KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary, , , , , , HU

    P. Csato, Z. Fodor, J. Gal, S. Hegyi, P. Lévai, J. Molnár, G. Palla, F. Sikler, I. Szentpetery, J. Sziklai, G. Vesztergombi & J. Zimanyi

  5. CERN, Geneva, Switzerland, , , , , , CH

    J. Bächler, N. Buncic, P. Buncic, M.I. Ferguson, H.G. Fischer, R. Stock, S. Wenig & S. White

  6. Institute of Nuclear Physics, Cracow, Poland, , , , , , PL

    J. Bartke, E. Gładysz, P. Gorodetsky, M. Kowalski & A. Rybicki

  7. Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany, , , , , , DE

    H. Appelshäuser, R. Bock, R. Brockmann, C. Markert, C. Roland, A. Sandoval, H. Sann & D. Vranic

  8. University of California at Davis, Davis, USA, , , , , , US

    F.P. Brady, D. Cebra, J. Dunn & L. Wood

  9. Joint Institute for Nuclear Research, Dubna, Russia, , , , , , RU

    V.I. Kolesnikov, A.I. Malakhov, G.L. Melkumov & A.Yu. Semenov

  10. Fachbereich Physik der Universität, Frankfurt, Germany, , , , , , DE

    C. Bormann, D. Flierl, P. Foka, M. Fuchs, F. Gabler, M. Gaździcki, J. Günther, H. Hümmler, S. Poziombka, R. Renfordt, D. Röhrich, G. Roland, D. Schmischke & H. Ströbele

  11. University of California at Los Angeles, Los Angeles, USA, , , , , , US

    G. Igo, B. Lasiuk, S. Trentalange & C. Whitten

  12. Fachbereich Physik der Universität, Marburg, Germany, , , , , , DE

    F. Eckhardt, V. Friese, T. Henkel, A. Piper & F. Pühlhofer

  13. Max-Planck-Institut für Physik, Munich, Germany, , , , , , DE

    V. Eckardt, P. Freund, A. Mock, W. Rauch, E. Schäfer, N. Schmitz, S. Schönfelder, P. Seyboth & J. Seyerlein

  14. Institute for Nuclear Studies, Warsaw, Poland, , , , , , PL

    H. Białkowska

  15. Institute for Experimental Physics, University of Warsaw, Warsaw, Poland, , , , , , PL

    J. Grebieszkow, W. Retyk & E. Skrzypczak

  16. Nuclear Physics Laboratory, University of Washington, Seattle, WA, USA, , , , , , US

    S.J. Bailey, P. Chan, J.G. Cramer, P.B. Cramer, D.J. Prindle, J.G. Reid, T.A. Trainor, D.D. Weerasundara & X.-Z. Zhu

  17. Yale University, New Haven, CT, USA, , , , , , US

    J.W. Harris & T. Ullrich

  18. Rudjer Boskovic Institute, Zagreb, Croatia, , , , , , HR

    K. Kadija

Authors
  1. H. Appelshäuser
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  2. J. Bächler
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  3. S.J. Bailey
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  4. L.S. Barnby
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  9. R. Bock
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  16. D. Cebra
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  22. J. Dunn
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  28. Z. Fodor
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NA49 Collaboration

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Received: 16 February 1998 / Revised version: 30 March 1998

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Appelshäuser, H., Bächler, J., Bailey, S. et al. Spectator Nucleons in Pb+Pb Collisions at 158 A·GeV . EPJ A 2, 383–390 (1998). https://doi.org/10.1007/s100500050135

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  • DOI: https://doi.org/10.1007/s100500050135

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