An endoscopic detector for ultracold neutrons L. Göltl, Z. Chowdhuri, M. Fertl, F. Gray, R. Henneck, K. Kirch, B. Lauss, T. Lefort, A. Mtchedlishvili, P. Schmidt-Wellenburg and G. Zsigmond Eur. Phys. J. A, 49 1 (2013) 9 Published online: 21 January 2013 DOI: 10.1140/epja/i2013-13009-8