FIZIKA B 15 (2006)  1, 9 -22

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STUDY OF RELATIVISTIC FORWARD-BACKWARD HADRON PRODUCTION IN THE INTERACTIONS OF 3He AND 4He WITH EMULSION NUCLEI AT DUBNA ENERGY

A. ABDELSALAMa, M. S. EL-NAGDYb, E. A. SHAATa, N. ALI-MOSSAc,
O. M. OSMANa, Z. ABOU-MOUSSAa, S. KAMELd,1 N. RASHEDe, W. OSMANa, M. E. HAFIZd, B. M. BADAWYf and S. MAGD ELDINa

aPhysics Department, Faculty of Science, Cairo University, Egypt
bPhysics Department, Faculty of Science, Helwan University, Cairo, Egypt
cBasic Science Department, Faculty of Engineering, Zagazig University, Shoubra, Egypt
dPhysics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
ePhysics Department, Faculty of Science, Cairo University, El-Fayom Branch, Egypt
fReactor Physics Department, Nuclear Research Center, Atomic Energy Authority Egypt
1E-mail address: sayedks@hotmail.com

Received 31 January 2004;        Accepted 6 June 2006
Online 10 November 2006

The experimental results on 3He- and 4He-emulsion interactions accompanied by relativistic (shower) hadrons flying into the backward (qlab 90) hemisphere at 4.5A GeV/c are presented and analyzed. The dependence of the probabilities of these interactions on the different target sizes, impact parameter and projectile spectator charges is studied. An investigation of average values and multiplicity distributions of these hadrons for the interactions with light and heavy emulsion nuclei has been carried out. In addition, the correlations between the multiplicities of different types of the emitted particles are studied. The data show that backward shower particles are a sensitive target parameter. The values of impact parameters can be used as good indicators for selecting events which occured with light or heavy emulsion nuclei. A comparison with the modified cascade model shows a good performance in describing the data produced in the region having less cascading (i.e. interactions with light nuclei). As for the interactions with heavy nuclei, the model overestimates the experimental data.

PACS numbers: 25.75.-q, 25.55.-e,
UDC 539.172

Keywords: 3He- and 4He-emulsion interactions, backward shower particles, multiplicity distributions, modified cascade model

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