Coherent neutron scattering amplitudes obtained from chemical compounds

Abstract Coherent Neutron Scattering Amplitudes Obtained from Chemical Compounds Utilizing the small angle scattering of slow neutrons by Christiansen-filters we could determine with a good accuracy the scattering amplitudes of powders by comparing with wellknown liquids. Investigations on powders of halides and sulfates yielded coherent scattering amplitudes of the bound atoms (in 10 -13 cm) : a (Na) = 3.63 ±0.02; a(K) =3.71 ±0.02; a (Rb) =7.08 ± 0.02; a (Cs) = 5.42 ± 0.02; a(Tl) =8.89 ±0.02; a (Br) =6.77 ±0.02; and a (I) =5.28 ±0.02. The scattering amplitudes of the liquids and the elements as standards are based on directly determined amplitudes from gravity-mirror measurements.