Measurement of parity nonconservation and an anapole moment in cesium

被引：1028

作者：

Wood, CS

Bennett, SC

Cho, D

Masterson, BP

Roberts, JL

Tanner, CE

Wieman, CE

机构：

[1] JOINT INST LAB ASTROPHYS,BOULDER,CO 80309

[2] UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309

来源：

SCIENCE | 1997年 / 275卷 / 5307期

关键词：

D O I：

10.1126/science.275.5307.1759

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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(E1(pnc))/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.

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页码：1759 / 1763

页数：5

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