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

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

OSTI ID:7019135

Yelon, W B; Schupp, G

The scientific progress made during the past year can be broadly classified into three categories. First, new techniques were found for measuring Mossbauer parameters using our microfoil conversion electron (MICE) detector. The MICE detector, coupled with our high intensity sources and a LiF crystal monochromator, has permitted an accurate measurement of both the interference parameter and the lifetime of the Mossbauer isomer for the 46.5 keV transition in /sup 183/W. The MICE detector was also 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. Signal-to-background enhancement attained by this technique for the 46.5 keV line of /sup 183/W was a factor of three better than that found for an intrinsic germanium detector in transmission geometry. Secondly in 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 found which is independent of the scattering wave vector, contrasting completely with the common k/sup 2/ dependence associated with phonons. The high intensity Mossbauer sources which were fabricated (100 Ci) permitted the k space resolution in gamma scattering comparable to an x-ray machine, while still maintaining the energy resolution of Mossbauer spectroscopy. The first resolution function analysis for gamma scattering was carried out and applied to TDS studies in silicon. 8 refs.

• Research Organization: Missouri Univ., Columbia (USA). Research Reactor Facility
• DOE Contract Number: FG02-85ER45200
• OSTI ID: 7019135
• Report Number(s): DOE/ER/45200-2-10/86; ON: DE87003379
• Country of Publication: United States
• Language: English

Related Subjects

656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BETA DECAY RADIOISOTOPES
CHARGED PARTICLE DETECTION
DAYS LIVING RADIOISOTOPES
DETECTION
E2-TRANSITIONS
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON DETECTION
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GADOLINIUM 153
GADOLINIUM ISOTOPES
GAMMA DETECTION
HEAVY NUCLEI
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIFETIME
M1-TRANSITIONS
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PHOTONUCLEAR REACTIONS
RADIATION DETECTION
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SCATTERING
SECONDS LIVING RADIOISOTOPES
SEMIMETALS
SILICON
STABLE ISOTOPES
TERBIUM 159
TERBIUM ISOTOPES
TUNGSTEN 183
TUNGSTEN ISOTOPES
YTTERBIUM 170
YTTERBIUM ISOTOPES