Research Article

Measurement of Parity Nonconservation and an Anapole Moment in Cesium

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Science  21 Mar 1997:
Vol. 275, Issue 5307, pp. 1759-1763
DOI: 10.1126/science.275.5307.1759

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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)/β = −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.

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