Электронный каталог

Статья

Alekseev, V.I.
The Effect of Crystalline Mosaicity on the Spectral-Angular Distribution of Parametric X-Ray Radiation / V.I.Alekseev, E.Yu.Kidanova, [a.o.]. – Text : electronic // Radiation Physics and Chemistry. – 2026. – Vol. 242. – P. 113595. – URL: https://doi.org/10.1016/j.radphyschem.2026.113595. – Bibliogr.: p. 113595-6.

This work presents a systematic experimental-theoretical investigation of parametric X-ray radiation (PXR) generated by relativistic electrons in mosaic crystals of highly oriented pyrolytic graphite (HOPG). The study focuses on the influence of crystal mosaicity on the spectral-angular distribution of PXR. Experiments were performed in backscattering geometry (with an observation angle close to 180&sup(o)) using 7 MeV electrons from the Röntgen-1 setup, which provides precise beam control and high-resolution semiconductor spectroscopy. Four HOPG grades with mosaic spreads ranging from 0.4&sup(o) to 3.5&sup(o) were analyzed, and orientation dependences of the PXR yield (also called rocking curves) were measured for the first diffraction orders (002)–(008). Increasing mosaicity produces quantitative broadening of rocking curves accompanied by reduction in peak intensity: when mosaicity increases from 0.4&sup(o) to 3.5&sup(o), the FWHM of orientational dependence of the PXR yield for the (002) reflection increases from 10&sup(o) to 12&sup(o), while the peak intensity decreases by a factor of 1.3. The results agree with the kinematical PXR theory for mosaic crystals for the first diffraction orders, while the broadening of rocking observed for higher orders indicates the need for refinement of the theoretical model. These findings clarify how mosaic spread governs the spectral-angular distribution of PXR and inform the optimization of compact X-ray sources suitable for laboratory-scale applications.



Спец.(статьи,препринты) = С 332.8 - Синхротронное излучение. Лазеры на свободных электронах. Получение и использование рентгеновских лучей
ОИЯИ = ОИЯИ (JINR)2026
Бюллетени = 28/026