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A LOW TEMPERATURE THERMOMETER UTILIZING THE MOSSBAUER EFFECT

Technical Report ·
OSTI ID:4014517
An absolute thermometer for use in the region below 1 deg K is discussed. The recoil-free resonant emission and absorption of gamma rays, known as the Mossbauer effect, was used to study the changes of the populations of the nuclear spin sub-levels at low temperatures. The intensity changes in the magnetic hyperfine spectrum are related to the number of nuclei in each sub-level and the populations of each sub-level depend on the Boltzmann factor. The theory is discussed for the case of a low-temperature source of Co/sup 5//sup 7/ in Fe metal, with the 14.4-kev resonant gamma ray in the decay scheme analyzed by a room temperature absorber containing Fe/sup 5//sup 7/ and for the inverse case of a low-temperature Fe/sup 5//sup 7/ absorber and a room temperature source. Experimental results confirmed the theory. Some advantages and limitations of the thermometer are presented. (auth)
Research Organization:
Los Alamos Scientific Lab., N. Mex.
NSA Number:
NSA-15-018269
OSTI ID:
4014517
Report Number(s):
TID-12627
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ENGINEERING AND EQUIPMENT