New Measurement of the Electron Magnetic Moment and the Fine Structure Constant
Journal Article
·
· Physical Review Letters
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)
A measurement using a one-electron quantum cyclotron gives the electron magnetic moment in Bohr magnetons, g/2=1.001 159 652 180 73 (28) [0.28 ppt], with an uncertainty 2.7 and 15 times smaller than for previous measurements in 2006 and 1987. The electron is used as a magnetometer to allow line shape statistics to accumulate, and its spontaneous emission rate determines the correction for its interaction with a cylindrical trap cavity. The new measurement and QED theory determine the fine structure constant, with {alpha}{sup -1}=137.035 999 084 (51) [0.37 ppb], and an uncertainty 20 times smaller than for any independent determination of {alpha}.
- OSTI ID:
- 21123775
- Journal Information:
- Physical Review Letters, Vol. 100, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.100.120801; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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