Neutron-velocity selector

Science with neutrons

Foundations
Neutron temperature Flux, Radiation, Transport Cross section, Absorption, Activation
Neutron scattering
Neutron diffraction Small-angle neutron scattering GISANS Reflectometry Inelastic neutron scattering Triple-axis spectrometer Time-of-flight spectrometer Backscattering spectrometer Spin-echo spectrometer
Other applications
Neutron tomography Activation analysis, Prompt gamma activation analysis Fundamental research with neutrons: Ultracold neutrons, Interferometry Fast neutron therapy Neutron capture therapy
Infrastructure
Neutron sources: Research reactor, Spallation, Neutron moderator Neutron optics: Reflector, Supermirror Detection
Neutron facilities
America: HFIR, LANSCE, NIST CNR -SNS Australia: OPAL Asia: J-PARC, HANARO Europe: BER II, FRM II, ILL, ISIS Neutron and Muon Source, JINR, SINQ Historic: IPNS, HFBR Under construction: ESS
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A neutron-velocity selector is a device that allows neutrons of defined velocity to pass while absorbing all other neutrons, to produce a monochromatic neutron beam.^[1] It has the appearance of a many-bladed turbine. The blades are coated with a strongly neutron-absorbing material, such as Boron-10.

Neutron-velocity selectors are commonly used in neutron research facility to produce a monochromatic beam of neutrons. Due to physical limitations of materials and motors, limiting the maximum speed of rotation of the blades, these devices are only useful for relatively slow neutrons.

References

^ C. D. Clark; E. W. J. Mitchell; D. W. Palmer; I. H. Wilson (1966). "The design of a velocity selector for long wavelength neutrons" (PDF). Journal of Scientific Instruments. 43 (1): 1–5. Bibcode:1966JScI...43....1C. doi:10.1088/0950-7671/43/1/302.