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

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

2010-06-15

arxiv.org/abs/1006.2970v2

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures

Scientific paper

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

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