Virtual Excitation and Multiple Scattering Correction Terms to the Neutron Index of Refraction for Hydrogen.
The neutron index of refraction is generally derived theoretically in the Fermi approximation. However, the Fermi approximation neglects the effects of the binding of the nuclei of a material as well as multiple scattering. Calculations by Nowak introduced correction terms to the neutron index of refraction that are quadratic in the scattering length and of order 10(-3) fm for hydrogen and deuterium. These correction terms produce a small shift in the final value for the coherent scattering length of H2 in a recent neutron interferometry experiment.
University of Missouri-Columbia, Columbia, MO 65211, USA.
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K
Schoen
Indiana University/IUCF, Bloomington, IN 47408, USA.
W M
WM
Snow
University of Missouri-Columbia, Columbia, MO 65211, USA.
H
H
Kaiser
University of Missouri-Columbia, Columbia, MO 65211, USA.
S A
SA
Werner
Nowak correction; neutron interferometry; neutron optics; refractive index; scattering length