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- W2755804523 abstract "At Institut Laue-Langevin (ILL) and Paul Scherrer Institute (PSI), we have measured the losses and depolarization probabilities of ultracold neutrons on various materials: (i) nickel-molybdenum alloys with weight percentages of 82/18, 85/15, 88/12, 91/9, and 94/6 and natural nickel Ni100, (ii) nickel-vanadium NiV93/7, (iii) copper, and (iv) deuterated polystyrene (dPS). For the different samples, storage-time constants up to $ensuremath{sim}460phantom{rule{0.16em}{0ex}}mathrm{s}$ were obtained at room temperature. The corresponding loss parameters for ultracold neutrons, $ensuremath{eta}$, varied between $1.0ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$ and $2.2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$. All $ensuremath{eta}$ values are in agreement with theory except for dPS, where anomalous losses at room temperature were established with four standard deviations. The depolarization probabilities per wall collision $ensuremath{beta}$ measured with unprecedented sensitivity varied between $0.7ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}6}$ and $9.0ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}6}$. Our depolarization result for copper differs from other experiments by 4.4 and 15.8 standard deviations. The $ensuremath{beta}$ values of the paramagnetic NiMo alloys over molybdenum content show an increase of $ensuremath{beta}$ with increasing Mo content. This is in disagreement with expectations from literature. Finally, ferromagnetic behavior of NiMo alloys at room temperature was found for molybdenum contents of 6.5 at.% or less and paramagnetic behavior for more than 8.7 at.%. This may contribute to solving an ambiguity in literature." @default.
- W2755804523 created "2017-09-25" @default.
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- W2755804523 date "2017-09-19" @default.
- W2755804523 modified "2023-10-18" @default.
- W2755804523 title "Losses and depolarization of ultracold neutrons on neutron guide and storage materials" @default.
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