Sv. Zhukov et al., GAMMA-RAY SPECTROMETRY STUDY OF THE HEATING OF ULTRACOLD NEUTRONS AS THEY INTERACT WITH A SURFACE, JETP letters, 57(8), 1993, pp. 464-468
A direct experiment was carried out to determine the reasons for the a
nomalous heating of ultracold neutrons as they interact with the surfa
ce of a material. The hypothesis that hydrogen is the main cause of th
is heating has been confirmed by a gamma-ray spectrometry method.