Mass dependence of π 0-production in heavy ion collisions at 1 A GeV

The production of neutral pions has been studied in the reactions 40 Ar+ nat Ca , 86 Kr+ nat Zr and 197 Au+ 197 Au at 1 A GeV. For high energy pions emitted from the heavier systems a steeper than linear rise of the pion multiplicity with the centrality of the reaction is observed, indicating a pion...

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Published in:Physics letters. B 1994, Vol.321 (1), p.20-25
Main Authors: Schwalb, O., Pfeiffer, M., Berg, F.-D., Franke, M., Kühn, W., Metag, V., Notheisen, M., Novotny, R., Ritman, J., Röbig-Landau, M.E., Alard, J.P., Bastid, N., Brummund, N., Dupieux, P., Gobbi, A., Herrmann, N., Hildenbrand, K.D., Hlaváč, S., Jeong, S.C., Löhner, H., Montarou, G., Neubert, W., Raschke, A.E., Simon, R.S., Sodan, U., Šumbera, M., Teh, K., Venema, L.B., Wilschut, H.W., Wessels, J.P., Wienold, T., Wohlfahrt, D.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:The production of neutral pions has been studied in the reactions 40 Ar+ nat Ca , 86 Kr+ nat Zr and 197 Au+ 197 Au at 1 A GeV. For high energy pions emitted from the heavier systems a steeper than linear rise of the pion multiplicity with the centrality of the reaction is observed, indicating a pion production process other than binary nucleon-nucleon collisions. At low transverse momenta an enhancement of the π 0-multiplicity increasing with the mass of the collision system is found. Systematic discrepancies between the experimental results and recent BUU, QMD and Cascade calculations are discussed.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(94)90322-0