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Neutral transverse momentum spectra in 60 and 200A·GeV16O+nucleus and proton+nucleus reactions |
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| Authors: | R. Albrecht T. C. Awes C. Baktash P. Beckmann F. Berger R. Bock G. Classon L. Dragon R. L. Ferguson A. Franz S. Garpman R. Glasow H. A. Gustafsson H. H. Gutbrod K. H. Kampert B. W. Kolb P. Pristiansson I. Y. Lee H. L?hner I. Lund F. E. Obenshain A. Oskarsson I. Ottrlund T. Peitzmann S. Persson F. Plasil A. M. Poskanzer M. Purschke H. G. Ritter R. Santo H. R. Schmidt T. Siemiarczuk S. P. Sorensen E. Stenlung G. R. Young WA Collaboration |
| Affiliation: | 1. Gesellschaft für Schwerionenforschung (GSI), D-6100, Darmstadt, Federal Republich of Germany 2. Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA 3. University of Münster, D-4400, Münster, Federal Republic of Germany 4. Lawrence Berkeley Laboratory, 94720, Berkeley, CA, USA 5. University of Lund, S-22 362, Lund, Sweden 6. University of Tennessee, 37996, Knoxville, TN, USA |
| Abstract: | Transverse momentum (p T) distributions fo inclusive photons and neutral pions at midrapidity are measured with a lead glass calorimeter in 60 and are measured with a lead glass calorimeter in 60 and 200A·Gev16O+nucleus and and proton+nucleus reactions. Inclusive photon distributions are compared for central and peripheral reactions. The degree of centrality is determined either from the charged particle multiplicity or from the remaining projectile energy in the forward direction. Deviations from a nucleus+nucleus interaction model based upon linear extrapolation from p+p reactions are observed in central16O+Au data. The variation of theaverage transverse momentum is investigated as function of centrality. The target-mass and energy dependence of π0 p T distributions are presented. For16O+Au a change of slope in these distributions is observed atp t ≈0.8 GeV/c compatible with hydrodynamic expansion models. |
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