Neutron interferometry: a status report

The present experimental status of neutron interferometry is reviewed. Presently there is a variety both of crystal and non-crystal interferometers available covering a wide range of experimental requirements. Also, neutron interferometry has been moved into the time domain through the observation of time-dependent phase factors. Furthermore, the difficulties associated with the extreme sensitivity of neutron interferometer operation to ambient vibration noise have been overcome such that it became possible to do experiments both with rapidly moving phase shifters and even with moving interferometers