A. I. Egorov

A new upper limit on the electric dipole moment of the neutron

Abstract New measurements have reduced the upper limit for the electric dipole moment of the neutron to | d | −25 e cm (90% confidence level).

Search for an Electric Dipole Moment of the Neutron

The result of measuring the electric dipole moment (EDM) of the neutron by using ultracold neutrons is presented. The results of the measurements give the value of the EDM: d/sub n/4=(plus-or-minus7.5) x 10/sup -25/ excm. Hence, it can be concluded that vertical-bardvertical-bar<1.6 x 10/sup -24/ excm at the 90% confidence level.

A search for the electric dipole moment of the neutron using ultracold neutrons

Abstract The results of measurements of the electric dipole moment (EDM) of the neutron using ultra-cold neutrons (UCN) are presented. A description is given of the source of UCN devised, and of a magnetic resonance spectrometer confining UCN for ≈ 5 s. The use of a double-chamber spectrometer and a system for double analysis of polarization enabled us to eliminate most of the systematic errors possible. The measurements resulted in the EDM d =(4±7.5) × 10 −25 e · cm. From this it is inferred that ¦d¦ −24 e · cm at the confidence level of 90%.