New limits on time-reversal invariance from the hyperfine structure of thallium fluoride
- 31 August 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 59 (9) , 991-994
- https://doi.org/10.1103/physrevlett.59.991
Abstract
We have made a very precise test of time-reversal invariance using nuclear-spin resonance in a thallium fluoride molecular beam. We searched for a shift of the 120-kHz Tl resonance when an external electric field was reversed relative to the nuclear spin and found it to be (-2.2±2.1)× Hz, less than 0.02 ppm and a fivefold improvement over any previous measurement. Our result imposes new constraints on the proton electric dipole moment and on CP nonconservation in strong and weak interactions.
Keywords
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