Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT

Details Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT

2008-11-11

arxiv.org/abs/0811.1635v2

Physics

Nuclear Physics

Nuclear Experiment

accepted for publication in Proceedings International Workshop on Particle Physics with Slow Neutrons

Scientific paper

The gravitational spectrometer GRANIT will be set up at the Institut Laue Langevin. It will profit from the high ultracold neutron density produced by a dedicated source. A monochromator made of crystals from graphite intercalated with potassium will provide a neutron beam with 0.89 nm incident on the source. The source employs superthermal conversion of cold neutrons in superfluid helium, in a vessel made from BeO ceramics with Be windows. A special extraction technique has been tested which feeds the spectrometer only with neutrons with a vertical velocity component v < 20 cm/s, thus keeping the density in the source high. This new source is expected to provide a density of up to 800 1/cm3 for the spectrometer.

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