Measurements of small heating of UCNs and total losses of UCNs in traps coated with Fomblin oils of different polymeric molecular weight
Fomblins are oils of a special kind, in which Hydrogen atoms are substituted with Fluor atoms. One application of such oils is their use as coatings for material bottles in experiments with storage of ultracold neutrons (UCNs). Fomblin oils with different polymeric molecular weights demonstrate significantly different physical properties. This difference is expected to result to different behavior and size of UCN losses. We are going to measure the probability of total losses of UCNs and also the probability of small heating of UCNs for Fomblins with different oil molecules as a function of the molecular weight, the temperature, the energy and the time evolution. The results are important for analysis of existing neutron lifetime experiments, for properly designing future neutron lifetime experiments with largely improved accuracy and for analysis of contributing mechanisms of small heating of UCNs.
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NESVIZHEVSKY Valery; CHERNYAVSKIY Sergey; GELTENBORT Peter; Egor Lychagin; MUZYCHKA Alexei; REYNAUD Serge and STRELKOV Aleksandr. (2015). Measurements of small heating of UCNs and total losses of UCNs in traps coated with Fomblin oils of different polymeric molecular weight. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-14-350
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