الفهرس 
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Abstract
1.1. Slow Neutrons:
This thesis presents a study for the interaction of
slow neutrons with solids through application of the time-offlight
technique, to study their small-angle-scattering from
metals and powders.
The slow neutron energy range includes the thermal
region, in which the energies are of the order of 0.1-0.005
eV, and• cold neutron region of energies from 0.005 eV to
0.001 eV. Neutrons whose energies are much less than 0.001
eV are occasionally described as ultra-cold(l).
It is important to note, however, that the phrase ”slow
neutrons” is frequently used to describe neutrons with
energies up to 1000 eV, but we shall restrict our attention
(2)
to the energy range just defined. The de-Broglie wavelength
of such neutrons is greater than -9 10 cm.
The low energy and relatively long wavelength of such
neutrons govern their interaction with matter. This depends
on the atomic structure of the target material because the
wavelength of slow neutrons is of the order of the interatomic
distances. It also depends on the atomic dynamics in
the scattering medium where the energy of slow neutrons.