New measurement of the electron magnetic moment and the fine structure constant |
| |
Authors: | Hanneke D Fogwell S Gabrielse G |
| |
Affiliation: | Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. |
| |
Abstract: | 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{-1}=137.035 999 084 (51) [0.37 ppb], and an uncertainty 20 times smaller than for any independent determination of alpha. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|