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Science 21 March 1997:
Vol. 275. no. 5307, pp. 1759 - 1763
DOI: 10.1126/science.275.5307.1759
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Research Articles

Measurement of Parity Nonconservation and an Anapole Moment in Cesium

C. S. Wood, S. C. Bennett, D. Cho, * B. P. Masterson, † J. L. Roberts, C. E. Tanner, ‡ C. E. Wieman §

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.

The authors are with JILA and the Department of Physics, University of Colorado, Boulder, CO 80309, USA.
*   Present address: Department of Physics, University of Korea, Seoul, Korea.

†   Present address: Melles Griot, Boulder, CO 80301, USA.

‡   Present address: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.

§   To whom correspondence should be addressed.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Strange Magnetism and the Anapole Structure of the Proton.
R. Hasty, A. M. Hawthorne-Allen, T. Averett, D. Barkhuff, D. H. Beck, E. J. Beise, A. Blake, H. Breuer, R. Carr, S. Covrig, et al. (2000)
Science 290, 2117-2119
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Science. ISSN 0036-8075 (print), 1095-9203 (online)