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- W2000861138 abstract "We studied the phenomenon of relatively small changes in the energy of ultracold neutrons (UCN) (when compared to thermal motion energy) when these are reflected on a surface. The changes observed involved both increases in UCN energy (their heating) and decreases (cooling) of the order of ~ 10 -7 eV. The probability values of this process on various surfaces ranged between 10 -8 and 10 -5 per one collision; the probability of such a small heating was many times larger than that of such a small cooling. We measured the spectra of such heated neutrons and the dependence of small heating probability on the temperature of sample out-gazing. We found that out-gazing of samples in vacuum at a temperature of 500–600 K could increase the small heating probability on stainless steel surface by a factor of ~ 100; and on copper surface by a factor of ~ 10. We observed, for the first time, extremely intensive small heating of UCN on powder of diamond nanoparticles. Neither small heating of UCN, nor nanoparticles could be found on a sapphire single crystal surface. This set of experimental data indicates that the inelastic scattering of UCN on weakly bound nanoparticles at a surface in a state of thermal motion is responsible for the process investigated." @default.
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- W2000861138 date "2007-12-01" @default.
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- W2000861138 title "AN INVESTIGATION INTO THE ORIGIN OF SMALL ENERGY CHANGES (~ 10-7eV) OF ULTRACOLD NEUTRONS IN TRAPS" @default.
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- W2000861138 doi "https://doi.org/10.1142/s0219581x07005085" @default.
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