Parity Mixing of 0+ and 0- Levels in 18F

Creators: Evans, H. C.; Ewan, G. T.; Kwan, S.-P.; Leslie, J. R.; MacArthur, J. D.; Mak, H.-B.; McLatchie, W.; Page, S. A.; Skesved, P.; Wang, S.-S.; McDonald, A. B.; Barnes, C. A.; Alexander, T. K.; Clifford, E. T. H.

Abstract

The circular polarization of the γ rays emitted in the transition from the 1.081-MeV state to the ground state in 18F has been measured to be (1.6±5.6)×10^-4, corresponding to a parity-nonconserving (PNC) matrix element |〈0+, I=1|VPNC|0-, I=0〉|=0.03±0.10 eV. The weak pion-nucleon coupling constant deduced from the weighted average of all recent 18F measurements is (0.28-0.28+0.89)×10^-7. This result, together with PNC matrix elements in other experiments, suggests that the isovector weak NN interaction may be strongly suppressed compared with the isoscalar weak NN interaction.

Additional Information

©1985 The American Physical Society. Received 15 July 1985. The authors would like to thank Professor E.G. Adelberger for many helpful suggestions and Dr. H.E. Swanson for the loan of equipment. This work is supported by the Natural Sciences and Engineering Research Council (Canada) and the National Science Foundation.

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