Measurement of Muon Anomalous Magnetic Moment

The anomalous magnetic moment of cosmic muons are measured. The measurement is made by observing the decay positrons when the cosmic muon is stopped in an absorber held within a magnetic field (50 to 250 Gauss). Both the initial muon and the positron are detected by scintillation counters around the absorber and magnet assembly. The preliminary value of g=1.904 is obtained from a week's worth of data.