On the possibility of refinement of the neutron electric charge by the neutron spin echo method using ultracold neutrons

An experiment is proposed on precise measurement of neutron electric charge by the neutron spin echo method using ultracold neutrons (UCN). The essence of the method, experimental arrangement and sensitivity calculations are presented. It is shown that the use of UCN regardless of the intensity decrease gives a gain in sensitivity by several orders of magnitude as compared with thermal neutrons. The calculations show possibility of an experiment with a sensitivity of 10-21 electron change