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FIZIKA B 15 (2006) 1, 9 -22
 
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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