Type of Work
Physical Review C
We have produced very large nuclear alignments in radioactive K-36 (half-life 0.34 sec) through laser optical pumping techniques. The K-36 was created through (p,n) reactions using a 50 nA, 22 MeV proton beam, and a 3.3 atmosphere Ar-36 target. Measurements were made with the target cell at room temperature, when direct optical pumping produces nuclear orientation in the K-36, and at elevated temperatures 160 degrees C and 180 degrees C) where the K-36 is oriented through a combination of direct optical pumping and spin exchange. The fraction of the maximal nuclear alignment for the 180 degrees C data was determined to be 0.46+/-0.07 stat+/-0.05 syst through measurements of the gamma-ray anisotropy following positron decay. Roughly 10(5) or more decays of oriented K-36 occurred each second. The application of the superallowed decay of K-36 to measurements of time-reversal symmetry in beta decay is discussed.
Young, A. R.; Anderson, W. S.; Calaprice, F. P.; Cates, G. D.; Jones, Gordon L.; Krieger, D. A.; and Vogelaar, R. B., "Laser oriented K-36 for time-reversal symmetry measurements" (1995). Hamilton Digital Commons.
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