Neutron optics of the PSI ultracold-neutron source: characterization and simulationG. Bison, B. Blau, M. Daum, L. Göltl, R. Henneck, K. Kirch, B. Lauss, D. Ries, P. Schmidt-Wellenburg and G. ZsigmondEur. Phys. J. A, 56 2 (2020) 33DOI: https://doi.org/10.1140/epja/s10050-020-00027-w