Dressed Neutrons

Abstract

When neutrons are exposed to a large number of electromagnetic quanta of arbitrary frequency their spin rotation about a static magnetic field can be suppressed completely. Further, natural-linewidth level-crossing signals in the neutron polarization can be produced. These observed effects are interesting also in connection with neutron electric-dipole-moment and neutron oscillation experiments. They are described in the dressed-particle formalism developed in atomic physics. We were able to reconstruct the dressed-neutron energy-level diagram experimentally.