title: Determination of the Newtonian gravitational constant G with time-of-swing method.
abstract: 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}.
authors: Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China. junluo@mail.hust.edu.cn
authors: Jun
authors: J
authors: Luo
authors: Qi
authors: Q
authors: Liu
authors: Liang-Cheng
authors: LC
authors: Tu
authors: Cheng-Gang
authors: CG
authors: Shao
authors: Lin-Xia
authors: LX
authors: Liu
authors: Shan-Qing
authors: SQ
authors: Yang
authors: Qing
authors: Q
authors: Li
authors: Ya-Ting
authors: YT
authors: Zhang