Neutron transportation in a closed vessel

Results of the experiments on measurement of ultracold neutron (UCN) storage time in moving vessels are reported. A theory for change of the UCN spectrum in the vessel swinging on a long thread like a pendulum is presented. It is found that the average kinetic energy of the UCN increases proportionally to the first derivative of the acceleration but only during those quarters of a period in which the absolute magnitude of acceleration increases. The results of measurement and theoretical consideration of UCN storage time in a vessel struck by a hammer are also given