Measurement of the Anomalous Magnetic Moment of the Muon

The anomalous magnetic moment of the muon was measured directly by storing polarized muons in a magnetic field for as long as 1000 cyclotron periods. The anomalous moment, a = (g-2)/2, was found to be a/sub exp/ = a/sub th/(0.983 plus or minus moment expected from the quantum electrodynamics of a Dirac particle. Interpretations of this good agreement between theory and experiment are given. (D.L.C.)