RIKEN BNL Supercomputer Wins Gordon Bell Prize Measuring
Vol. 53 - No. 9 March 19, 1999 BROOKHAVEN NATIONAL LABORATORY 344th Brookhaven Lecture Measuring Forces With the Muon g-2 Experiment at the AGS At the Alternating Gradient Syn- own axis. It therefore acts like a tiny chrotron (AGS), an intriguing experi- magnet, with a north and south pole ment, E821, recently completed its and a magnetic moment, which is the first major run. name given to a magnet’s strength. The experimenters, some 70 re- During each muon’s 2.2 millionths searchers from BNL and 11 institu- of a second lifetime, it constantly emits tions in Germany, Japan, Russia and and reabsorbs a cloud of even more the U.S., have built the world’s largest short-lived particles, which modify the superconducting magnet coil in order muon’s electric and magnetic force. to make one of the world’s smallest The complex interactions in the muon measurements. They are measuring cloud are known to contain traces of the energy and time at which the elec- every elementary form of matter. tron particles fly off decaying muon If a muon orbits in a magnetic field particles that are spinning round a created by another magnet, its mag- perfectly circular orbit in a magnetic netic moment and its spin rotate with field. Roger Stoutenburgh about the same frequency around the Why do that? external field. The rotation frequency To give the answer, one of the E821 of the spin is proportional to a factor researchers, Associate Scientist Ralf called “g.” Prigl, AGS, will give the 344th Brook- If g were exactly 2, the spin axis, haven Lecture, “Probing the Nature of initially pointing in the direction of Force: The Muon g-2 Experiment at Ralf Prigl at the muon g-2 experiment at BNL’s Alternating Gradient travel, would always move in step the AGS.” Prigl will be introduced by Synchrotron.
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