Neutron multiscattering in Si monocrystal observed from the time-of-flight method

In order to study the diffraction of slow neutrons on perfect monocrystals the Bragg multiscattering of neutrons on perfect Si monocrystal in dependence on the angular resolution of the time-of-flight diffractometer was experimentally investigated. The measurements were performed with the WKSN neutron spectrometer at the IBR-30 reactor beam. A horizontal and vertical beam divergence was constant and equal to 1 deg 20 min. An angle of neutron scattering on monocrystal was 2theta-77 deg 27 min. The obtained results show the presence in the experiment of the Bragg multireflection which may strongly complicate some experiments with monocrystals employing the time-of-flight method