An ultracold neutron storage bottle for UCN density measurements
  We have developed a storage bottle for ultracold neutrons (UCN) in order to measure the UCN density at the beamports of the Paul Scherrer Institute's (PSI) UCN source. This paper describes the design, construction and commissioning of the robust and mobile storage bottle with a volume comparable to typical storage experiments 32 liter e.g. searching for an electric dipole moment of the neutron. 
G. Bison, F. Burri, M. Daum, K. Kirch, J. Krempel, B. Lauss, M. Meier,   D. Ries, P. Schmidt-Wellenburg, G. Zsigmond
physics.ins-det nucl-ex