الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 98 |  |  |
| | | from | 98 | | |
Abstract
The present thesis is concerned with the study of two mechanisms
of heavy ion nuclear collisions at high energies. The first one is the
”direct stripping reaction” while the second one is the ”fire-ball model”
. The thesis consists of two parts. In the first part the angular
distribution of the following nuclear reactions;
6Li + Emulsion ~ d + X~
6Li + Emulsion ~ 4He +X·,
12C+ (A& BT)
12C+H
12C+CNO
~ (Z=2) + X~
~ (Z=2) + X~
~ (Z=2) + X and
12C + Emulsion ~ (Z=3 or Z=4 or Z=5) + X.
are studied in the framework of direct stripping mechanism at incident
momentum (4.5 A GeV/c) where ”X” is the residual nucleus. [In this
model one considers the projectile consisting of two clusters, one of
them is absorped by the target and the other continuous its flight
without any change].
In the second part the angular distribution of the following nuclear
reactions ~
-1-
56Fe + Emulsion -4 4He + X~at = 1.7 GeV/A ~
40Ar + Emulsion ~ 4He + X~at = 2.0 GeV/A ~
160 + Emulsion ~ 4He + X~ at = 2.1 GeV/A ~
20Ne + Emulsion ~ 4He + X~ at = 3.6 GeV/A ~
20Ne + Emulsion ~ P + X~at = 3.6 GeV/A ~
28Si+ Emulsion ~ 4He + X~ at = 3.6 GeV/A and
28Si+ Emulsion -4P + X; at = 3.6 GeV/A.
are calculated in the framework of the ”fire-ball model”. [In this model,
the fire-ball is formed in the overlapping region between relativistic
heavy ion projectile and target nucleus].
from the obtained results we may conclude that :-
(1) The loosely bound projectile nuclei are well explained by the direct
stripping mechanism at high energy. this mechanism shows an
agreement with experimental data for outgoing fragments with
Z<3. For outgoing fragments which have Z> 3, the agreement
between theoretical calculations and experimental data is not quite
complete. The fragments with Z > 3 seem to be emerging from a
formed fire-ball region in a non-equilibriwn stage.
(II) The kinetic temperature T (Me V) of the fire ball depends on the
incident energy per nucleon.
(III) The kinetic temperature T (Me V) of the fire-ball does not depend
on the projectile nuclear masses at the same incident energy.
-n-
-- ------------- -----------
(IV) The kinetic temperature T (Me V) of the fire-ball does not depend
on the multiplicity of the outgoing particles at the same incident
energy.