Determination of the Newtonian gravitational constant G with time-of-swing method.
Determination of the Newtonian gravitational constant G with time-of-swing method.
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DOI：
10.1103/physrevlett.102.240801
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发表时间：
2009-06
影响因子：
8.6
通讯作者：
Jun Luo;Qi Liu;L. Tu;C. Shao;Lin-Xia Liu;Shanqing Yang;Qing Li;Yating Zhang
中科院分区：
文献类型：
--
作者：
Jun Luo;Qi Liu;L. Tu;C. Shao;Lin-Xia Liu;Shanqing Yang;Qing Li;Yating Zhang
本文用摆动时间法给出了牛顿引力常数G的一个新值。通过以下几点改进，大大降低了测量的不确定性：（1）直接测量纤维的滞弹性;（2）采用球形源质量，减小了密度不均匀性和偏心率的影响;（3）采用石英摆，简化了振型，减小了惯性矩的不确定性;（4）将摆和源质量都设置在真空室中，减小了测量相对位置的误差。通过两个单独的实验，我们获得G = 6.673 49（18）x 10;{-11} m;{3} kg;{-1} s;{-2}，标准不确定度约为2.6/10;{5}。
We present a new value of the Newtonian gravitational constant G by using the time-of-swing method. Several improvements greatly reduce the uncertainties: (1) measuring the anelasticity of the fiber directly; (2) using spherical source masses minimizes the effects of density inhomogeneity and eccentricities; (3) using a quartz block pendulum simplifies its vibration modes and minimizes the uncertainty of inertial moment; (4) setting the pendulum and source masses both in a vacuum chamber reduces the error of measuring the relative positions. By two individual experiments, we obtain G = 6.673 49(18) x 10;{-11} m;{3} kg;{-1} s;{-2} with a standard uncertainty of about 2.6 parts in 10;{5}.