2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 10, 177-181

Central events in the interactions of $\bf {^{28}Si}$ and $\bf {^{32}S}$ 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 $\mathsf{^{28}Si}$ (14.6 AGeV) and $\mathsf{^{32}S}$ (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.

PACS
25.75.-q - Relativistic heavy-ion collisions.

© Società Italiana di Fisica, Springer-Verlag 2001