Moessbauer line-shape parameters for sup 183 W and sup 191 Ir in metallic tungsten and iridium

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.7405· OSTI ID:5624951

Bullard, B R; Mullen, J G ^[1]; Schupp, G ^[2]

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1. Physics Department, Purdue University, West Lafayette, Indiana 47907 (USA)
2. Physics Department, University of Missouri, Columbia, Missouri 65211 (USA)

We have carried out precise Moessbauer line-shape analyses in tungsten and iridium metal using an exact representation of the line shape in transmission. By using exceptionally intense sources ({similar to}70 Ci for {sup 183}Ta) and carefully chosen constraints between sets of Moessbauer-effect spectra, we have been able to make a quantitative test of the theory of final-state effects. The temperature dependence of the recoilless fraction, {ital f}{sub {ital a}}({ital T}), for {sup 183}W in tungsten metal has been determined to about 1% accuracy, which is an order of magnitude better than previous Moessbauer or x-ray investigations, between 80 and 1067 K. The Debye model fits our results from 80 through 968 K, with a Debye Moessbauer temperature of 336.5 K, when a correction for thermal expansion is included. The recoilless fraction data were used to derive a value of 8.76(10) for the internal conversion coefficient for the 46.5-keV transition in {sup 183}W, with an approach based on the quasiharmonic approximation to the lattice vibrations, which determines the temperature dependence of the recoilless fraction. The interference parameters, times 100, that we find in this investigation of {sup 183}W in tungsten metal (46.5 keV) and {sup 191}Ir in iridium metal (129 keV), are {minus}0.317(6) and {minus}0.77(10), respectively. These values are both greater in magnitude than the theoretically calculated values by about 10%, although the {sup 191}Ir case has errors large enough that the comparison with theory is inconclusive. These results differ with theory, and would indicate that the theoretical calculations of interference need refinement if they are to be used in studies of time-reversal invariance.

• DOE Contract Number: FG02-85ER45199
• OSTI ID: 5624951
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
EXPANSION
HEAVY NUCLEI
HIGH TEMPERATURE
INTERNAL CONVERSION RADIOISOTOPES
INVARIANCE PRINCIPLES
IRIDIUM
IRIDIUM 191
IRIDIUM ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LINE WIDTHS
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
MOESSBAUER EFFECT
NUCLEI
ODD-EVEN NUCLEI
PLATINUM METALS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
T INVARIANCE
TANTALUM 183
TANTALUM ISOTOPES
TEMPERATURE DEPENDENCE
THERMAL EXPANSION
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN 183
TUNGSTEN ISOTOPES
VERY HIGH TEMPERATURE