New source for ultracold neutrons at the Institut Laue-Langevin

F. M. Piegsa, M. Fertl, S. N. Ivanov, M. Kreuz, K. K.H. Leung, P. Schmidt-Wellenburg, T. Soldner, O. Zimmer

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A new intense superthermal source for ultracold neutrons (UCN) was installed at a dedicated beam line at the Institut Laue-Langevin. Incident neutrons with a wavelength of 0.89 nm are converted to UCN in a 5-liter volume filled with superfluid He4 at a temperature of about 0.7 K. The UCN can be extracted to room temperature experiments. We present the cryogenic setup of the source, a characterization of the cold neutron beam, and UCN production measurements, where a UCN density in the production volume of at least 55 per cm3 was determined.

Original languageEnglish
Article number015501
JournalPhysical Review C - Nuclear Physics
Issue number1
StatePublished - 23 Jul 2014


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