论文标题
$^{87} $ sr时钟频率在主CS时钟极限处的长期测量
Long term measurement of the $^{87}$Sr clock frequency at the limit of primary Cs clocks
论文作者
论文摘要
我们报告了一系列42个测量值429〜Thz（5s $^2 $）〜$^1 $ s $ s $ _0 $ - （5S5P）〜$^3 $^3 $^3 $ p $ _0 $ in $^{87} $ SR $^{87} $ sr从2017年到2019年从2017年到2019年。实验室跨晶格时钟和初级剖宫河时钟CSF1和CSF2。每种测量运行的长度已通过使用氢mas作为飞轮扩大，以改善CS时钟给出的统计不确定性。我们确定平均的过渡频率$ 429 \：228 \：004 \：229 \：873.00（0.07）$ 〜Hz，$ 1.5 \ times10^{ - 16} $分数不确定性，在当前实现单位Hertz的限制下。数据的分析提供了对太阳与质子 - 电子质量比$μ$耦合的偶联的限制，并确认了其时间漂移的限制。
We report on a series of 42 measurements of the transition frequency of the 429~THz (5s$^2$)~$^1$S$_0$--(5s5p)~$^3$P$_0$ line in $^{87}$Sr taken over three years from 2017 to 2019. They have been performed at the Physikalisch-Technische Bundesanstalt (PTB) between the laboratory strontium lattice clock and the primary caesium fountain clocks CSF1 and CSF2. The length of each individual measurement run has been extended by use of a hydrogen maser as flywheel to improve the statistical uncertainty given by the Cs clocks. We determine an averaged transition frequency of $429\:228\:004\:229\:873.00(0.07)$~Hz with $1.5\times10^{-16}$ fractional uncertainty, at the limit of the current realization of the unit hertz. Analysis of the data provides an improved limit on the coupling of the gravitational potential of the Sun to the proton--electron mass ratio $μ$, and confirms the limits on its temporal drift.
