A method for evaluating the transmission properties of ultracold-neutron guides

I. Altarev, A. Frei, P. Geltenbort, E. Gutsmiedl, F. J. Hartmann, A. R. Müller, S. Paul, C. Plonka, D. Tortorella

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A method for evaluating the properties of guides for ultracold neutrons (UCN) has been developed as an extension of the common technique for measuring UCN losses in the sample contained between two diaphragms. With two measurements at both ends of the guide one can evaluate both, the loss probability μ per wall collision and the probability f for diffuse scattering from the wall. A 3.4 m long aluminum tube coated with a double layer of stainless steel (thickness 500 nm) and beryllium (thickness 250 nm), proposed as a UCN guide for the Mini-D2 UCN source at the FRM-II reactor at Garching, was tested. We obtained μ = (1.1 ± 0.1) × 10- 3 and f = 0.18 ± 0.04. Systematic errors and a possible improvement of the method are discussed.

Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
StatePublished - 1 Jan 2007
Externally publishedYes


  • Neutron guide
  • UCN
  • Ultracold neutrons


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