Diffraction of slow neutrons on semiplanes

Technical Report · Sat Dec 01 04:00:00 EST 1973

OSTI ID:4939800

Friedrich, H; Heintz, W

Discrepancies between theory and experiment in neutron diffraction have been reported by Landknmmer. Therefore, diffraction patterns of simple obstacles like absorbing straight edges or phase-shifting half-planes were observed in the coherent beam of neutrons leaving the neutron conductor tube of the FMRB. The diffraction patterns predicted by Huygens principle were calculated with the neutron spectrum taken into account. The measured first maximum in the diffraction figure of an absorbing straight edge is lower than that according to theory. The minimum produced by phase-shifting transparent half-planes seems to be independent of the phase difference, contrary to the calculations. It is shown that the roughness at the edges of the probes does not influence the diffraction patterns to the degree shown by the experiments. By use of different probe materials no influence by small-angle scattering could be obsertved. (18 figures, 1 table) (auth)

• Research Organization: Physikalisch-Technische Bundesanstalt, Braunschweig (F.R. Germany). Forschungs- und Messreaktor
• Sponsoring Organization: Sponsor not identified
• NSA Number: NSA-29-030683
• OSTI ID: 4939800
• Report Number(s): PTB-FMRB--51
• Country of Publication: Germany
• Language: German

Related Subjects

ALUMINIUM
COPPER
FOILS
HUYGENS PRINCIPLE
MANGANESE
N68100* --Physics (Nuclear)--Neutron Interactions with Matter
NEUTRON DIFFRACTION
SLABS
SLOW NEUTRONS