Status of the BNL muon (g-2) experiment

The muon (g-2) experiment at Brookhaven completed a first run in June and J uly 1997. The main components of the experiment, which include the supercon ducting inflector, the superferric storage ring, the electrostatic quadrupo les and the lead scintillating fiber electron calorimeters, have been commi ssioned satisfactorily. Our first measurement of the ratio R of the spin pr ecession frequency of the positive muon relative to that of a free proton, R = (3.707 219+/-0.000 048 x 10(-3), is in good agreement with the previous CERN measurements for mu(+) and mu(-), and has approximately the same unce rtainty as each of these measurements. Ln spring 1998 a muon kicker was ins talled and successfully tested in the storage ring magnet and a significant improvement in the knowledge of the muon g-factor Is expected from upcomin g runs in August 1998 and January 1999.