Production of ultra-cold neutrons in solid α-oxygen E. Gutsmiedl, F. Böhle, A. Frei, A. Maier, S. Paul, A. Orecchini and H. Schober EPL, 96 6 (2011) 62001 Published online: 01 December 2011 DOI: 10.1209/0295-5075/96/62001