Multiple Bragg reflections of neutrons accompanying an allowed reflection

Abstract

In this paper the results of particular studies of multiple Bragg reflection (MBR) effects accompanying a strong Si(111) reflection in the cylindrically bent perfect crystal at the neutron wavelength of 0.162 nm are presented. Contrary to a common view that MBR effects could be considered negligible or represent maximally a few percent of an effect related to a single allowed reflection, it is shown that in the case of a homogeneously deformed perfect single crystal (in this case cylindrically bent Si crystal) and particular diffraction geometry they can be even several times higher.