Abstract
Neutron-optical phenomena which appear at coherent interaction of neutrons with a sample, when the neutron spin is precessing in a magnetic field, are considered. As follows from very general considerations, such interaction results in an extra precession phase, which adds to the phase of the Larmor precession. These phenomena may be interpreted as a manifestation of the delay in time caused by the neutron interaction with the sample and measured by the Larmor clock. Results of recent experiments on the direct measurement of the difference between neutron velocity inside matter and its velocity in vacuum are reported. An accuracy of the time measurement of 4 · 10−10 sec was achieved permitting us to start a number of experiments on the direct measurement of the neutron interaction time with quantum objects. In addition the possibility of neutron phase contrast imaging based on neutron spin precession optics is discussed.
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