The University Of Missouri Gamma-ray Scattering Facility


The field of gamma-ray scattering is new and only a few of the possible applications of the technique have been pursued. At the University of Missouri Research Reactor (MURR) we are presently completing two instruments to perform studies not previously attempted. The first instrument is a full-circle diffractometer with additional differential ω-motion and linear drive system for the detector which will be used for accurate crystallographic structure measurements at either 0.125 Å (153Sm) or 0.03 Å (198Au). The reduced absorption and extinction at these wavelengths should permit more accurate structure factor determination than has been possible with either X-rays or neutrons. A unique source irradiation system and shield cask have been designed to permit the utilization of relatively large, extremely intense sources. The cask is self-centering at the instrument and has a built in rotation of the source container to maximize the intensity. A large exit aperture is provided in the vertical direction (∼3″) to give extra intensity when tight collimation is not required in that direction. The second instrument will be using the 103 keV photons from 153Sm as a Mössbauer source and will detect inelastically scattered photons with a centrifugally driven absorber. Because of the high specific activities attainable in the flux trap at MURR (∼6000 Ci/g for enriched 152Sm) these experiments should be possible where such studies with traditional sources, e.g., 57Fe, have not succeeded. © 1979.




National Science Foundation, Grant None

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Publication Date

01 Nov 1979