Random flux redistribution observed for α-particles transmitted through Si, Ni and Pt crystals

Flux redistribution with formation of channeling peaks, observed earlier for protons and heavy-ions in Si, has now been studied for α-particles transmitted through thin Pt, Ni and Si crystals. The channeling peaks are detected in all cases when the final energy of the alphas is below 4 MeV. Even at...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2002-06, Vol.193 (1), p.144-151
Main Authors: Karamian, S.A, Grüner, F, Assmann, W, Günther, W, Ponomarenko, V.A, Schmidt, B, Tretyakova, S.P
Format: Article
Language:English
Subjects:
Angular distribution
Channeling
Cooling
Crystals
Random flux
Transmission
α-Particles
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Summary:Flux redistribution with formation of channeling peaks, observed earlier for protons and heavy-ions in Si, has now been studied for α-particles transmitted through thin Pt, Ni and Si crystals. The channeling peaks are detected in all cases when the final energy of the alphas is below 4 MeV. Even at very low energies ≈0.1 MeV/amu, the “heating” minima are not visible unlike for heavy-ions. Detected peculiarities are discussed, and qualitatively understood. The flux-redistribution mechanism includes the regularized charge variation, with corresponding changes in the potential part of transverse energy, in the presence of energy losses and multiple scattering.
ISSN:0168-583X
1872-9584
DOI:10.1016/S0168-583X(02)00741-3