Determination of the Newtonian Gravitational Constant G with Time-of-Swing Method

作者：Luo Jun^*; Liu Qi; Tu Liang Cheng; Shao Cheng Gang; Liu Lin Xia; Yang Shan Qing; Li Qing; Zhang Ya Ting

来源：Physical Review Letters, 2009, 102(24): 240801.

DOI：10.1103/PhysRevLett.102.240801

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)x10(-11) m(3) kg(-1) s(-2) with a standard uncertainty of about 2.6 parts in 10(5).

• 出版日期2009-6-19
• 单位华中科技大学