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After discussing the feasibility and possible usefulness of a neutron interferometer, we describe an arrangement whereby Fresnel interferences have been obtained for neutrons with wavelengths of about 4.4 ~ in a 10 meter flight path with a 0-0t mm entrance slit, using two glass prisms instead of the Fresnel biprism. A useful separation of the two coherent beams of 0-06 mm has been reached. Possible improvements of the method are discussed.

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