2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 2, 383-390


Spectator Nucleons in Pb+Pb Collisions at 158 A$\cdot$GeV

H. Appelshäuser7 - J. Bächler5 - S.J. Bailey16 - L.S. Barnby3 - J. Bartke6 - R. A. Barton3 - H. Bia\l 
kowska14 - C.O. Blyth3 - R. Bock7 - C. Bormann10 - F.P. Brady8 - R. Brockmann7 - N. Buncic5,10 - P. Buncic5,10 - H.L. Caines3 - D. Cebra8 - P. Chan16 - G.E. Cooper2 - J.G. Cramer16,13 - P.B. Cramer16 - P. Csato4 - J. Dunn8 - V. Eckardt13 - F. Eckhardt12 - M.I. Ferguson5 - H.G. Fischer5 - D. Flierl10 - Z. Fodor4 - P. Foka10 - P. Freund13 - V. Friese12 - M. Fuchs10 - F. Gabler10 - J. Gal4 - M. Gazdzicki10 - E. G\l 
adysz6 - P. Gorodetskyf - J. Grebieszkow15 - J. Günther10 - J.W. Harris17 - S. Hegyi4 - T. Henkel12 - L.A. Hill3 - I. Huang2,8 - H. Hümmler10 - G. Igo11 - D. Irmscher2,7 - P. Jacobs2 - P.G. Jones3 - K. Kadija18,13 - V.I. Kolesnikov9 - M. Kowalski6 - B. Lasiuk11 - P. Lévai4 - A.I. Malakhov9 - S. Margetis2 - C. Markert7 - G.L. Melkumov9 - A. Mock13 - J. Molnár4 - J.M. Nelson3 - G. Odyniec2 - G. Palla4 - A.D. Panagiotou1 - A. Petridis1 - A. Piper12 - R.J. Porter2 - A.M. Poskanzer2 - S. Poziombka10 - D.J. Prindle16 - F. Pühlhofer12 - W. Rauch13 - J.G. Reid16 - R. Renfordt10 - W. Retyk15 - H.G. Ritter2 - D. Röhrich10 - C. Roland7 - G. Roland10 - H. Rudolph2,10 - A. Rybicki6 - I. Sakrejda2 - A. Sandoval7 - H. Sann7 - A.Yu. Semenov9 - E. Schäfer13 - D. Schmischke10 - N. Schmitz13 - S. Schönfelder13 - P. Seyboth13 - J. Seyerlein13 - F. Sikler4 - E. Skrzypczak15 - G.T.A. Squier3 - R. Stock5,10 - H. Ströbele10 - I. Szentpetery4 - J. Sziklai4 - M. Toy2,11 - T.A. Trainor16 - S. Trentalange11 - T. Ullrich17 - M. Vassiliou1 - G. Vesztergombi4 - D. Vranic7,18 - F. Wang2 - D.D. Weerasundara16 - S. Wenig5 - S. White - C. Whitten11 - T. Wienold2 - L. Wood8 - T.A. Yates3 - J. Zimanyi4 - X.-Z. Zhu16 - R. Zybert3
NA49 Collaboration

1 Department of Physics, University of Athens, Athens, Greece
2 Lawrence Berkeley National Laboratory, University of California, Berkeley, USA
3 Birmingham University, Birmingham, England
4 KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
5 CERN, Geneva, Switzerland
6 Institute of Nuclear Physics, Cracow, Poland
7 Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany
8 University of California at Davis, Davis, USA
9 Joint Institute for Nuclear Research, Dubna, Russia
10 Fachbereich Physik der Universität, Frankfurt, Germany
11 University of California at Los Angeles, Los Angeles, USA
12 Fachbereich Physik der Universität, Marburg, Germany
13 Max-Planck-Institut für Physik, Munich, Germany
14 Institute for Nuclear Studies, Warsaw, Poland
15 Institute for Experimental Physics, University of Warsaw, Warsaw, Poland
16 Nuclear Physics Laboratory, University of Washington, Seattle, WA, USA
17 Yale University, New Haven, CT, USA
18 Rudjer Boskovic Institute, Zagreb, Croatia

Received: 16 February 1998 / Revised version: 30 March 1998 Communicated by V. Metag

Abstract
The composition of forward-going projectile spectator matter in fixed-target Pb+Pb collisions at 158 A$\cdot$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.

PACS
25.75.-qRelativistic heavy-ion collisions


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