Observation of Pendellösung Fringe Structure in Neutron Diffraction

Abstract

Observations are reported on the appearance of Pendell\"osung interference fringes within neutron Bragg reflections. These have been used to determine the atomic scattering amplitude of silicon for neutrons as (0.41646\ifmmode\pm\else\textpm\fi{}0.00022)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}12}$ cm. Conclusions are drawn concerning the spatial extent of the neutron wave packet from the fringe characteristics.