First production of ultracold neutrons with a solid deuterium source at the pulsed reactor TRIGA Mainz

A. Frei, Yu Sobolev, I. Altarev, K. Eberhardt, A. Gschrey, E. Gutsmiedl, R. Hackl, G. Hampel, F. J. Hartmann, W. Heil, J. V. Kratz, Th Lauer, A. Liźon Aguilar, A. R. Müller, S. Paul, Yu Pokotilovski, W. Schmid, L. Tassini, D. Tortorella, N. TrautmannU. Trinks, N. Wiehl

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43 Scopus citations

Abstract

The production rates of ultracold neutrons (UCN) with a solid deuterium converter have been measured at the pulsed reactor TRIGA Mainz. Exposed to a thermal neutron fluence of ∼ 1̇ 1013 n•cm-2 • pulse -1, the number of detected very cold and ultracold neutrons ranges up to 200 000 at 7mol of solid deuterium (sD2) in combination with a pre-moderator (mesitylene). About 50% of the measured neutrons can be assigned to UCN with energies E of VF(sD 2)= 105 neV and V F(guide) = 190 neV are the Fermi potentials of the sD2 converter and our stainless steel neutron guides, respectively. Thermal cycling of solid deuterium, which was frozen out from the gas phase, considerably improved the UCN yield, in particular at higher amounts of sD2.

Original languageEnglish
Pages (from-to)119-127
Number of pages9
JournalEuropean Physical Journal A
Volume34
Issue number2
DOIs
StatePublished - Nov 2007
Externally publishedYes

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