A long wavelength neutron monochromator for superthermal production of ultracold neutrons

C. E.H. Mattoni, C. P. Adams, K. J. Alvine, J. M. Doyle, S. N. Dzhosyuk, R. Golub, E. Korobkina, D. N. McKinsey, A. K. Thompson, L. Yang, H. Zabel, P. R. Huffman

Research output: Contribution to journalArticlepeer-review


Production of ultracold neutrons (UCN) by single-phonon downscattering of cold neutrons from superfluid helium (the "superthermal process") utilizes input neutrons only in a narrow wavelength band around 0.89 nm. Delivering a monochromatic 0.89 nm neutron beam to a superfluid helium target reduces backgrounds in the UCN production region with minimal loss in the UCN production rate. The design, construction, and testing of a 0.89 nm neutron monochromator is reported herein. This monochromator is constructed from nine tiled pieces of stage 2 potassium-intercalated graphite with mosaics between 1.1° and 2.1° and reflectivities of (73-91)% at 0.89 nm. In addition to stage 2 potassium-intercalated graphite, fluorophlogopite and stage 1 potassium-intercalated graphite are also characterized.

Original languageEnglish (US)
Pages (from-to)343-357
Number of pages15
JournalPhysica B: Condensed Matter
Issue number1-4
StatePublished - Feb 15 2004


  • Fluorophlogopite
  • Intercalated graphite
  • Mosaic crystal
  • Neutron monochromators
  • Superthermal process
  • Ultracold neutron production

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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