Measurement of the Permanent Electric Dipole Moment of the Neutron
Measurement of the Permanent Electric Dipole Moment of the Neutron
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DOI：
10.1103/physrevlett.124.081803
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发表时间：
2020-02-28
影响因子：
8.6
通讯作者：
Zsigmond, G.
中科院分区：
文献类型：
--
作者：
Abel, C.;Afach, S.;Zsigmond, G.
本文介绍了在Paul Scherrer研究所用Ramsey的超冷中子分离振荡磁场法测量中子电偶极矩的实验结果。我们的测量站在历史悠久的EDM实验探测物理违反时间反演不变性。该实验的显著特点是使用Hg-199 comagnetometer和一组光泵铯蒸汽磁力计来抵消和校正磁场变化。由两个独立的组对设盲数据集进行统计分析，而系统效应的估计得益于对磁场的前所未有的了解。中子EDM的测量值为d（n）=（0.0 +/- 1.1（stat）+/- 0.2（sys））× 10（-26）e.cm。
We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons. Our measurement stands in the long history of EDM experiments probing physics violating time-reversal invariance. The salient features of this experiment were the use of a Hg-199 comagnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic-field changes. The statistical analysis was performed on blinded datasets by two separate groups, while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. The measured value of the neutron EDM is d(n) = (0.0 +/- 1.1(stat) +/- 0.2(sys)) x 10(-26) e.cm.