Eur. Phys. J. A 10, 177-181
Central events in the interactions of
and
with heavy emulsion targets
M. El-Nadi1, M.S. El-Nagdy2, A. Abdelsalam1, E.A. Shaat1, N. Ali-Mossa3, Z. Abou-Moussa1, Kh. Abdel-Waged4, A.M- Abdalla3 and E. El-Falaky1
1 Physics Department, Faculty of Science, Cairo University, Egypt
2 Physics Department, Faculty of Science, Helwan University Ain Helwan, Cairo, Egypt
3 Basic Science Department, Faculty of Engineering, Shoubra, Egypt
4 Physics Department, Faculty of Applied Science, Umm Al-Qura University, P.O. Box 6924, Makkah, Saudi Arabia
kelwagd@yahoo.com
(Received: 20 June 2000 / Revised version: 4 December 2000 Communicated by C. Signorini)
Abstract
Data on the multiplicity of secondaries in central events of
(14.6 AGeV) and
(3.7 AGeV) interactions with AgBr emulsion
nuclei have been compiled and studied. The dependence of the multiplicities
of the outgoing charged stripping particles on the number of interacting
nucleons and therefore on the impact parameter, as indicated by the target
size, and consequently, on the degree of centrality is investigated. The
resultant multiplicity distribution of the produced pions for each studied
case is fitted by both Negative Binomial (NB) and Poisson distributions. The
NB distribution is valid for most of the considered cases. The transparency
of the target for a projectile was found to become more pronounced as the
incident energy increased.
25.75.-q - Relativistic heavy-ion collisions.
© Società Italiana di Fisica, Springer-Verlag 2001
