Inelastic scattering in condensed matter with high intensity moessbauer radiation

Technical Report · Wed May 01 04:00:00 EDT 1991

OSTI ID:5606556

Yelon, W B; Schupp, G

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 not 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 Bragg scattering filters to suppress unwanted radiation. These have led to a 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 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 make a novel independent determination of interference parameters and line-shape behavior in the resonance asymptotic region. This analysis is important to both 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 metal and the charge density wave satellite reflection Debye-Waller factor in TaS{sub 2}, which indicate phason rather than phonon behavior. Using a specially constructed sample cell which enables us to vary temperatures from {minus}10 C to 110 C, we have begun quasielastic diffusion studies in viscous liquids and current results are summarized. Included are the temperature and Q dependence of the scattering in pentadecane and diffusion in glycerol.

• Research Organization: Missouri Univ., Columbia, MO (USA). Research Reactor Facility
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: FG02-85ER45200
• OSTI ID: 5606556
• Report Number(s): DOE/ER/45200-7; ON: DE91014384
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BRAGG REFLECTION
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
EVEN-ODD NUCLEI
FOURIER TRANSFORMATION
GAMMA RADIATION
GAMMA SPECTROMETERS
HEAVY NUCLEI
HYPERFINE STRUCTURE
INELASTIC SCATTERING
INTEGRAL TRANSFORMATIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
IRIDIUM 191
IRIDIUM ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LINE WIDTHS
MEASURING INSTRUMENTS
MOESSBAUER EFFECT
MOESSBAUER SPECTROMETERS
NUCLEI
ODD-EVEN NUCLEI
PROGRESS REPORT
RADIATIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
REFLECTION
SCATTERING
SECONDS LIVING RADIOISOTOPES
SPECTROMETERS
STABLE ISOTOPES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TERBIUM 159
TERBIUM ISOTOPES
TRANSFORMATIONS
TUNGSTEN 183
TUNGSTEN ISOTOPES