Eur. Phys. J. A 12, 487-493 (2001)

Incoherent X-radiation produced by relativistic electrons in crystals

V.B. Gavrikov¹, V.P. Likhachev², J.D.T. Arruda-Neto^{2, 3} and A.L. Bonini<sup>2

1</sup>  Kharkov Institute of Physics and Technology, 1 Akademishna 61108 Kharkov, Ukraine
²  Laboratório do Acelerador Linear, Instituto de Física da Universidade de São Paulo, CP66318, 05315-970 São Paulo, SP, Brazil
³  University of Santo Amaro/UNISA, Brazil

gravrikov@axpfep1.if.usp.br

(Received: 2 July 2001 / Revised version: 29 September 2001 Communicated by Th. Walcher)

Abstract
Differential and integral features of incoherent X-radiation, induced by relativistic electrons in crystals, are studied for observation angles several times greater than , where is the projectile Lorentz factor. The existence of sharp maxima and a minimum of the five-folded incoherent differential cross-section as a function of the final electron angles, and a dip minimum when the cross-section is taken as a function of the photon energies, is demonstrated. At near backward observation angles the three-folded cross-section shows a maximum in the region of several keV photon energies. The obtained results allow us to optimize the conditions for coincidence experiments, minimizing the incoherent contribution to the total radiation yield, and helping to analyse results of finite-size detector experiments with crystal targets.

PACS
41.75.Ht - Relativistic electron and positron beams.
78.70.Ck - X-ray scattering.

© Società Italiana di Fisica, Springer-Verlag 2001