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Welcome to portal site of nEDM experiment at J-PARC

We propose to measure the electric dipole moment (EDM) of ultracold neutrons (UCNs) with the experimental sensitivity of 6 × 10-28 e·cm by constructing a UCN source driven by the pulsed proton beam at J-PARC. The sensitivity can be achieved by suppressing the systematic errors using downsized UCN storage volume. In order to improve the statistics in the smaller volume, we improve a time-focusing optics to transfer the instantaneously dense UCN, which can be obtained at a short-pulse spallation neutron source, to a remote place without losing the density. The proton beam of the J-PARC is almost ideal for this strategy. 

J-PARC UCN