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) × 10-25e · cm. From this it is inferred that |d| < 1.6 × 10-24e · cm at the confidence level of 90%. © 1980.