Využití efektů kanálování/blokování
When a beam of charged particles enters a single
crystal along a major crystallographic planar or
axial direction, one observes a spectacular reduction
of the yield associated to events that imply
close nuclear encounters (nuclear reaction, large
angle elastic scattering, formation of core-shell
electron vacancies on target atoms and corresponding
X-ray emission. . .). All these effects are
characteristic of a phenomenon called Channeling,
discovered and explained 40 years ago [1]. Channeling
is the direct consequence of the fact that, in
the particular beam-crystal geometry described
above, the particles experience strongly correlated
binary collisions with target atoms. These collisions
focus the beam far from the atomic strings or
planes of the crystal. Thus, the uniform flux
associated to an beam impinging a crystal
surface becomes progressively highly non-uniform
as the particles penetrate in the bulk, with a pronounced
maximum at the center of the ‘channels’
delimited by the atomic rows or planes.
The effect of channeling/blocking is studied with Medipix type semiconductor pixel detectors.
Řešitel
Spolupracovníci
Granty:
Články v impaktovaných časopisech
(0)