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An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
Preprint
C. A. Baker ,
D. D. Doyle ,
P. Geltenbort ,
K. Green ,
M. G. D. van der Grinten ,
P. G. Harris ,
P. Iaydjiev ,
S. N. Ivanov ,
D. J. R. May ,
J. M. Pendlebury ,
J. D. Richardson ,
D. Shiers ,
K. F. Smith
09 February 2006
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Abstract
An experimental search for an electric-dipole moment (EDM) of the neutron has been carried out at the Institut Laue-Langevin (ILL), Grenoble. Spurious signals from magnetic-field fluctuations were reduced to insignificance by the use of a cohabiting atomic-mercury magnetometer. Systematic uncertainties, including geometric-phase-induced false EDMs, have been carefully studied. Two independent approaches to the analysis have been adopted. The overall results may be interpreted as an upper limit on the absolute value of the neutron EDM of |d_n| < 2.9 x 10^{-26} e cm (90% CL).