Dynamical diffraction of neutrons and transition from beam splitter to phase shifter case

This paper presents formulas for the transmission and the reflection of neutrons on a perfect crystal blade in symmetric Laue geometry. While the standard formulas are valid either for the situation very close to the Bragg condition or far off the Bragg condition (index of refraction model) the formulas presented here smoothly cover the whole range of transition. The paper concludes with experimental considerations.