Strong scattering and parallel guiding of ultracold neutrons

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

For ultracold neutrons with a kinetic energy below 10 neV, strong scattering, characterized by 2πl꜀ / λ ≤ 1, can be obtained in metamaterials of C and ⁷ Li. Here l꜀ and λ are the coherent scattering mean free path and the neutron wavelength, respectively. UCN interferometry and high-resolution spectroscopy (nano-electronvolt to pico-electronvolt resolution) in parallel waveguide arrays of neutronic metamaterials are given as examples of new experimental possibilities.