Inelastic scattering in condensed matter with high intensity Moessbauer radiation: Progress report for period March 1, 1986-October 31, 1986

Technical Report · Wed Oct 01 04:00:00 EDT 1986

OSTI ID:6894332

Mullen, J G

The scientific progress made during the past year can be broadly classified into three categories. First, new techniques have been found for measuring Moessbauer parameters using a microfoil conversion electron (MICE) detector. The MICE detector, coupled with high intensity sources and a LiF crystal monochromator, has permitted an accurate measurement of both the interference parameter and the lifetime of the Moessbauer isomer for the 46.5 keV transition in /sup 183/W. The MICE detector has also been used in a double resonance geometry, where a conventional detector is replaced by a resonant MICE detector, to measure the temperature dependence of the recoil-free fraction for metallic tungsten. A second area where important scientific results were found was with the resonance scattering from TaS/sub 2/-1T. In addition to a sharp cusp in the inelastic scattering found just above the 80 K incommensurate to commensurate transition, a sharp discontinuity was found in the elastic and inelastic fractions of the scattered lines from the (100) primary satellites. A temperature dependence to the Debye-Waller factor was also found which is independent of the scattering wave vector, contrasting completely with the common k/sup 2/ dependence associated with phonons. High intensity Moessbauer sources have been fabricated (100 Ci) permit the k space resolution in gamma scattering comparable to an x-ray machine, while still maintaining the energy resolution of Moessbauer spectroscopy. Because of this capability, the first resolution function analysis for gamma scattering has been applied to TDS studies in silicon. 7 refs.

• Research Organization: Purdue Univ., Lafayette, IN (USA). Dept. of Physics
• DOE Contract Number: FG02-85ER45199
• OSTI ID: 6894332
• Report Number(s): DOE/ER/45199-T1; ON: DE87003996
• Country of Publication: United States
• Language: English

Related Subjects

440100 -- Radiation Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
656000* -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGED PARTICLE DETECTION
DEBYE-WALLER FACTOR
DETECTION
ELASTIC SCATTERING
ELECTROMAGNETIC RADIATION
ELECTRON DETECTION
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
GAMMA RADIATION
GAMMA SPECTROMETERS
HEAVY NUCLEI
INELASTIC SCATTERING
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
KEV RANGE 10-100
MEASURING INSTRUMENTS
MOESSBAUER EFFECT
MOESSBAUER SPECTROMETERS
NUCLEAR REACTIONS
NUCLEI
OXYGEN COMPOUNDS
PHONONS
PHOTONUCLEAR REACTIONS
QUASI PARTICLES
RADIATION DETECTION
RADIATIONS
RADIOISOTOPES
REFRACTORY METAL COMPOUNDS
SCATTERING
SECONDS LIVING RADIOISOTOPES
SEMIMETALS
SILICON
SPECTROMETERS
STABLE ISOTOPES
SULFATES
SULFUR COMPOUNDS
TANTALUM COMPOUNDS
TANTALUM SULFATES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN 183
TUNGSTEN ISOTOPES