Production of Ultra-Cold-Neutrons in Solid α-Oxygen
Europhysics Letters (epl)(2009)
摘要
Our recent neutron scattering measurements of phonons and magnons in solid
α-oxygen have led us to a new understanding of the production mechanismen
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 effcient in the down-scattering of thermal or cold neutrons into
the UCN energy regime.
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关键词
mean free path,neutron scattering
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