Gamma scattering in condensed matter with high intensity Moessbauer radiation
We give a progress report for the work which has been carried out in the last three years with DOE support. A facility for high-intensity Moessbauer scattering is now fully operational at the University of Missouri Research Reactor (MURR) as well as a facility at Purdue, using special isotopes produced at MURR. High precision, fundamental Moessbauer effect studies have been carried out using scattering to filter the unwanted radiation. These have led to a new Fourier transform method for describing Moessbauer effect (ME) lineshape and a direct method of fitting ME data to the convolution integral. These methods allow complete correction for source resonance self absorption (SRSA) and the accurate representation of interference effects that add an asymmetric component to the ME lines. We have begun applying these techniques to attenuated ME sources whose central peak has been attenuated by stationary resonant absorbers, to more precisely determine interference parameters and line-shape behavior in the resonance asymptotic region. This analysis is important to both the fundamental ME studies and to scattering studies for which a deconvolution is essential for extracting the correct recoilless fractions and interference parameters. A number of scattering studies have been successfully carried out including a study of the thermal diffuse scattering in Si, which led to an analysis of the resolution function for gamma-ray scattering. Also studied was the anharmonic motion in Na and the satellite reflection Debye-Waller factor in TaS{sub 2}, which indicate phason rather than phonon behavior. We have begun quasielastic diffusion studies in viscous liquids and current results are summarized. These advances, coupled to our improvements in MIcrofoil Conversion Electron spectroscopy lay the foundation for the proposed research outlined in this request for a three-year renewal of DOE support.
- Research Organization:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-85ER45199
- OSTI ID:
- 6360232
- Report Number(s):
- DOE/ER/45199-T3; ON: DE91001802; TRN: 90-035665
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GAMMA RADIATION
INELASTIC SCATTERING
SOLIDS
MOESSBAUER EFFECT
CROSS SECTIONS
DOPPLER EFFECT
DYSPROSIUM 159
HYPERFINE STRUCTURE
LINE WIDTHS
MURR REACTOR
NEUTRON DIFFRACTION
NEUTRONS
POLYMERS
PROGRESS REPORT
SILICON
TEMPERATURE DEPENDENCE
BARYONS
BETA DECAY RADIOISOTOPES
COHERENT SCATTERING
DIFFRACTION
DOCUMENT TYPES
DYSPROSIUM ISOTOPES
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ELEMENTS
ENRICHED URANIUM REACTORS
EVEN-ODD NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
NUCLEI
NUCLEONS
RADIATIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SCATTERING
SEMIMETALS
TANK TYPE REACTORS
TRAINING REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)
651100 - Nuclear Physics- Experimental Techniques- (1980-)