Creation of polarized ultracold neutrons and observation of Ramsey resonance for electric dipole moment measurement

摘要

Polarized UCNs have been created by selecting only one spin state passing through a magnetized Fe foil. Typical degree of polarization was about 90 %. The polarization relaxation time in the prototype Ramsey cell was T_1 = 1100~(+800) _(-400) s. Clear Ramsey resonance spectra have been observed for two precession time settings, t_c = 100 ms and 30 s. The transverse relaxation time T_2 was about 50 s.