Messung kohärenter Streulängen mit Christiansen-Filtern für Neutronenstrahlung

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Abstract
Measurements of Neutron-Scattering-Amplitudes using the Christiansen-Filter- Technique By means of Christiansen-Filters it is possible to make use of the high accuracy achieved for the scattering amplitudes of liquids also for solids in form of powders. We investigated the scattering law for the small angle scattering of Neutrons by Christiansen-Filters and found a good agreement between theory and experiment. Using powders of several elements we could measure the scattering amplitudes of the elements with an uncertainty within ± 0.2% to ± 1%. We got for the bound atoms of Al: a = (3.449±0.009) F; Nb: a = (7.11 ± 0.04 ) F; Cr: a = (3.532 ± 0.010) F; Te: a= (5.43 ± 0.04 ) F; Sb: a = (5.641 ± 0.012) F; and Ta: a = (6.91 ± 0.07) F. Si: a = (4.159±0.006) F;