Determination of Projectile Proton Beam Energy for the Best Yield of as-Isotopes from Ge-Crystal
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Date
1995-06
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Addis Ababa University
Abstract
To extract information for the appropriate proton beam energy, which will be used
for irradiating natural Ge crystal for the best yield of As isotopes, is the mere objective of
this work. Five slices of natural Ge crystal with various thickness have been prepared in
order to make energy degradation, and a proton beam energy of 35MeV is set to be incident
onto the fIrst slice. After irradiation measurement~ have been taken from each slice using a
~(Li) detector, and spectral analysis are also carried out. From the complete spectral
analysis and using a computer simulation programme called Transport of Ions in Matter
(TRllvI) the projectile proton beam energies are determined for the best yield of 71 As, 71 As,
'4As, '6As, 6'~, and 6'Ga isotopes.
In this thesis the experimental results are di~cussed, and calculations are carried out
for the cross-sections of the observed reaction product. From the dependence of the
cross-section versus projectile beam energy, extrapolation is made to estimate the
corresponding threshold energy for the reactions to occur
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The Best Yield of as-Isotopes from Ge-Crystal