Quantum versus classical approach of dechanneling and incoherent electromagnetic processes in aligned crystals (draft)

Particles traveling in aligned crystals at small angles w.r.t. crystallographic axes or planes are principally steered by the continuous Lindhard potential. This interaction conserves the energy E, the longitudinal momentum p∥, the transverse energy of the particle E⊥ and is elastic concerning the c...

Full description

Saved in:
Bibliographic Details
Published in:Journal of instrumentation 2020-04, Vol.15 (4), p.C04010-C04010
Main Author: Artru, X.
Format: Article
Language:English
Subjects:
Crystallography
Crystals
Energy conservation
Particle motion
Time dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Particles traveling in aligned crystals at small angles w.r.t. crystallographic axes or planes are principally steered by the continuous Lindhard potential. This interaction conserves the energy E, the longitudinal momentum p∥, the transverse energy of the particle E⊥ and is elastic concerning the crystal quantum state. At high enough energy the particle motion is quasi-classical. The time-dependent fluctuations of the positions of the atoms or of the electrons of the crystal create a residual potential, on which the particle can scatter. This interaction does not conserve the previous quantities and is inelastic for the crystal. We compare its treatments with the classical binary collision model and with a phenomenological quantum model. The classical dechanneling rate is estimated to be several ten per cent larger than the quantum one. The influence of correlated vibrations of neighboring atoms is discussed.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/15/04/C04010