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VOLUME 55 (1992) | ISSUE 2 | PAGE 92
Anomalous interaction of ultracold neutrons with the surface of a beryllium trap
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.