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Measurement of Parity Nonconservation and an Anapole Moment in Cesium
1The authors are with JILA and the Department of Physics, University of Colorado, Boulder, CO 80309, USA.
Science (New York, N.Y.)
|March 21, 1997
Abstract:
The amplitude of the parity-nonconserving transition between the 6S and 7S states of cesium was precisely measured with the use of a spin-polarized atomic beam. This measurement gives Im(E1pnc)/beta = -1.5935(56) millivolts per centimeter and provides an improved test of the standard model at low energy, including a value for the S parameter of -1.3(3)exp (11)theory. The nuclear spin-dependent contribution was 0.077(11) millivolts per centimeter; this contribution is a manifestation of parity violation in atomic nuclei and is a measurement of the long-sought anapole moment.