Mumm, H.
(2014),
Cryogenic Design and Performance of an Apparatus for Magnetically Trapping Ultracold Neutrons, Cryogenics, [online], https://doi.org/10.1016/j.cryogenics.2014.09.008, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917558 (Accessed May 9, 2026)
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Cryogenic Design and Performance of an Apparatus for Magnetically Trapping Ultracold Neutrons
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Abstract
The cryogenic design and performance of an apparatus used to magnetically confine ultracold neutrons (UCN) is presented. The apparatus is part of an effort to measure the beta-decay lifetime of the free neutron and is comprised of a high-current supercon- ducting magnetic trap that surrounds 21 l of isotopically pure 4He cooled to approximately 250 mK. A 0.89 nm neutron beam can enter the apparatus from one end of the magnetic trap and a light collection system allows visible light generated within the helium by decays to be transported to detectors at room temperature. Two cryocoolers are incorporated to reduce liquid helium consumption.Citation
Cryogenics
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Keywords
neutronlifetime, magnetictrap, cryocooler, ultracold neutrons
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Created October 5, 2014, Updated May 7, 2026