Observation of soft X-ray Cherenkov radiation in Be and Si foils

TL;DR

This paper reports the first experimental observation of X-ray Cherenkov radiation in Be and Si foils generated by 5.7 MeV electrons, providing new empirical data in a largely theoretical research area.

Contribution

It presents the first experimental detection of X-ray Cherenkov radiation in Be, expanding the empirical understanding of Cherenkov phenomena in the X-ray region.

Findings

Cherenkov radiation observed in Be for the first time

Experimental results align with theoretical transition radiation models

Provides new data on X-ray Cherenkov radiation in thin foils

Abstract

Currently, most of the Cherenkov phenomenon researches for the X-ray region are theoretical studies; there are only a few experiments in this area. Here the new experimental results on observation of X-ray Cherenkov radiation generated by 5.7 MeV electrons in the thin Be and Si foils are presented. The Cherenkov effect from Be was observed for the first time. The experimental results are compared with the calculations performed according to the theoretical model of transition radiation taking into account the oxide layer on the target output surface.