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We have investigated solid oxygen as a converter material for the productionof ultra-cold neutrons. In a first series of experiments the crystalpreparation was examined. An optically semi-transparent solid $\alpha$-oxygencrystal has been prepared. In a second series of experiments such a crystalprepared indentically as in the first series of experiments has been exposed tothe cold neutron flux of the MEPHISTO beam line of the FRM II. Ultra-coldneutrons produced inside the oxygen crystal have been extracted and the countrates have been measured at different converter temperatures. The results ofthese measurements give a clear signal of the superthermal UCN productionmechanism in $\alpha$-oxygen. The mean free loss length of UCN inside thecrystal at a temperature of 5\,K was determined to be in the order of$20\,\mathrm{cm}$.

Solid oxygen as converter for the production of ultra-cold neutrons