Abstract
The feasibility of a very cold neutron interferometer using multilayer mirrors is discussed. This device is a kind of Mach-Zehnder interferometer known in classical optics, using multilayer neutron monochromator mirror as optical elements. These mirrors consist of thin layers deposited on a very flat silicon multilayer substrate. Spacings of the multilayer are available in the range from 80 to 500 Å. We discuss the characteristics of the mirror, the accuracy with which the mirror positions must be adjusted to their position and the perfection of the mirror including the present status of our development. Applications to physics are listed.
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