Laser oriented K36 for time reversal symmetry measurements

A. R. Young, W. S. Anderson, F. P. Calaprice, G. D. Cates, G. L. Jones, D. A. Krieger, R. B. Vogelaar

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We have produced very large nuclear alignments in radioactive K36 (half-life 0.34 sec) through laser optical pumping techniques. The K36 was created through (p,n) reactions using a 50 nA, 22 MeV proton beam, and a 3.3 atmosphere Ar36 target. Measurements were made with the target cell at room temperature, when direct optical pumping produces nuclear orientation in the K36, and at elevated temperatures 160°C and 180°C) where the K36 is oriented through a combination of direct optical pumping and spin exchange. The fraction of the maximal nuclear alignment for the 180°C data was determined to be 0.460.07 stat0.05 syst through measurements of the -ray anisotropy following positron decay. Roughly 105 or more decays of oriented K36 occurred each second. The application of the superallowed decay of K36 to measurements of time-reversal symmetry in decay is discussed.

Original languageEnglish (US)
Pages (from-to)R464-R467
JournalPhysical Review C
Issue number2
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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