Neutron Interferometry at the National Institute of Standards and Technology

Figure 3

(a) Schematic of the second focusing PG monochromator for shaping the vertical momentum distribution of the neutron beam. By shielding some of the blades of the monochromator we can select different neutron momentum distributions. (b) Contrast versus path separations for different momentum distributions. The top figure is obtained when 9 blades of the 2nd monochromator are open, the middle figure when 5 middle blades are open, and the bottom figure when only one middle blade is open [14].

(a)

(b)