PARASITIC REFLECTIONS OF NEUTRONS IN CRYSTAL MONOCHROMATORS
The intensity of a monoenergetic neutron beam obtained by reflection from a crystal monochromator is very often decreased due to the additional so- called parasitic scattering. Since this effect gives several percent fluctuations of the intensity, it must be taken into account in precise measurements. In particular, it is important in neutron spectrum studies by Bragg reflection. For a given reflecting plane two parameters are responsible for multiple scattering: Bragg angle and spatial orientation of the monochromator. Suitable choice of the second parameter permits the elimination of parasitic reflection. The Cu monochromator is rotated about an axis perpendicular to the (111) reflecting plane. The intensity of reflected thermal neutrons is measured versus angle of rotation. Results showing the influence of multiple reflections are found to agree with calculated angular positions for chosen Bragg angles. (auth)
- Research Organization:
- Inst. for Nuclear Research, Warsaw
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-020890
- OSTI ID:
- 4052853
- Journal Information:
- Nuclear Instr. & Methods, Journal Name: Nuclear Instr. & Methods Vol. Vol: 10
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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