Coherent bremsstrahlung produced by relativistic positrons and electrons on a single crystal of silicon
1975; American Institute of Physics; Volume: 11; Issue: 3 Linguagem: Inglês
10.1103/physreva.11.736
ISSN0556-2791
AutoresRobert L. Walker, B. L. Berman, S. D. Bloom,
Tópico(s)Advanced X-ray Imaging Techniques
ResumoThe spectral dependence of the forward coherent bremsstrahlung produced by beams of 28-MeV positrons and electrons incident upon a 5-\ensuremath{\mu}m thick single crystal of silicon was measured with a NaI photon spectrometer. Effects of channeling and perhaps of the nonvalidity of the first Born approximation were observed for beam directions near the $〈111〉$ axis of the crystal. A coherent peak near 0.5 MeV for both electrons and positrons was observed for a compound-interference direction, in agreement with first-order theoretical calculations.
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