Anomalous interaction of ultracold neutrons with the surface of a beryllium trap
Alfimenkov V. P., Strelkov A. V., Shvetsov V. N., Nesvizhevskii V. V., Serebrov A. P., Tal'daev R. R., Kharitonov A. G.
The temperature dependence of the cross section for the interaction of ultracold neutrons with Be has been studied experimentally. A difference has been found between the cross sections for the neutron-Be interaction at the surface of the material and in its interior. This difference is =0.9 b. The corresponding value of the loss factor is 3 X10 "5 per reflection from the surface.