Direct measurement of the longitudinal coherence length of a thermal neutron beam
… 1, in which we coherently split a neutron beam at point 4, allow one of the beams to traverse
a region of potential Y extending over a distance D, and then allow it to recombine and
interfere with the other beamat point &. The potential has the effect of increasing the transit time
of the neutr on wave packet of path … expect the width of this curveto bethe root mean square
of the widths of the two packets; but, at what time~ If we start the clock at the time when the
neutron enters the interferometer and is Hragg reflected at the first crystal and use the transit …
a region of potential Y extending over a distance D, and then allow it to recombine and
interfere with the other beamat point &. The potential has the effect of increasing the transit time
of the neutr on wave packet of path … expect the width of this curveto bethe root mean square
of the widths of the two packets; but, at what time~ If we start the clock at the time when the
neutron enters the interferometer and is Hragg reflected at the first crystal and use the transit …
Abstract
When a series of aluminum slabs are placed in one leg of a perfect-silicon-crystal neutron interferometer, a continuous and significant loss of contrast is observed. This observation is interpreted as being due to the finite length of the neutron wave packets.
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