Abstract
Measurement of the free precession of nuclear spins in optically pumped ground-state atoms has allowed a test of Weinberg’s nonlinear generalization of quantum mechanics. Shifts among the three resolved precession frequencies in the spin-3/2 system were studied as a function of the projection of spin polarization along the precession axis. Our results set an upper limit on ε, Weinberg’s nonlinearity parameter, of ‖ε‖/2πħ<3.8μ Hz, which corresponds to 2.0× of the binding energy per nucleon. This is the most stringent such limit to date.
- Received 13 August 1990
DOI:https://doi.org/10.1103/PhysRevLett.65.2931
©1990 American Physical Society