Production of ultra-cold neutrons in solid α-oxygen

E. Gutsmiedl, F. Böhle, A. Frei, A. Maier, S. Paul, A. Orecchini, H. Schober

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Our recent neutron scattering measurements of phonons and magnons in solid α-oxygen have led us to a new understanding of the production mechanism of ultra-cold neutrons (UCN) in this super-thermal converter. The UCN production in solid α-oxygen is dominated by the excitation of phonons. The contribution of magnons to UCN production becomes only slightly important above E>10 meV and at E∼4 meV. Solid α-oxygen is in comparison to solid deuterium less efficient in the down-scattering of thermal or cold neutrons into the UCN energy regime. Nevertheless, the lower efficiency might be compensated by the larger mean free-path of UCN in oxygen with respect to deuterium.

Original languageEnglish
Article number62001
JournalEurophysics Letters
Issue number6
StatePublished - Dec 2011
Externally publishedYes


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