A novel apparatus for the investigation of material properties for the storage of ultracold neutrons

Bryś, T.; Daum, M.; Fierlinger, P.; Geltenbort, P.; George, David C.; Gupta, Mukul; Henneck, R.; Heule, S.; Horvat, M.; Kasprzak, M.; Kirch, K.; Kohlik, K.; Negrazus, M.; Pichlmaier, A.; Straumann, U.; Vranković, V.; Wermelinger, C.

doi:10.1016/j.nima.2005.05.076

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…1 (see also Ref. [31]). It consists essentially of the magnet (10,11), the UHV vessel with the storage tube (9), the switch (4), and the detector (5).…”

Section: Principle Of the Experimentsmentioning

confidence: 94%

“…1) is given in Ref. [31] we shall here only discuss the samples. Two different sample geometries were used: (a) one of purely cylindrical shape with solid substrate material and (b) one with a droplike cross section made from flexible substrate foils.…”

Section: Samplesmentioning

confidence: 99%

“…Details of the experimental setup have been published in Ref. [31] and only a brief description will be given here. The main results have appeared in a recent letter [32].…”

Section: Introductionmentioning

confidence: 99%

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Loss and spinflip probabilities for ultracold neutrons interacting with diamondlike carbon and beryllium surfaces

et al. 2007

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The storage of ultracold neutrons (UCN) in a combined magnetic, gravitational, and material trap is described. Wall materials investigated were diamondlike carbon (DLC) coatings on solid and flexible foil substrates as well as beryllium coatings on solid substrates. The loss coefficient per wall collision, η, and the depolarization probability β were measured simultaneously as a function of temperature (from 70 to 400 K) and energy (from 30 to 80 neV). The results at 70 K are η = (0.7 ± 0.1) × 10 −4 , β = (15.4 ± 1.0) × 10 −6 for DLC on polyethyleneterephtalate (PET) foil and η = (1.7 ± 0.1) × 10 −4 , β = (0.7 ± 0.3) × 10 −6 for DLC on aluminum foil. At room temperature the loss coefficients are larger by a factor of about 2 whereas the depolarization probabilities are found to be independent of temperature. The corresponding values for Be at room temperature are η ∼ 5 × 10 −4 , β ∼ 10 × 10 −6 . The DLC results for β and for the temperature-dependent part of the loss coefficient, η T , are interpreted in terms of incoherent scattering by hydrogen. The hydrogen admixture was measured independently by elastic recoil detection analysis to be about 1 × 10 16 atoms/cm 2 . The data do not support the hypothesis of hydrogen being chemically bound within the top layers of the DLC. Using two different models with a thin waterlike film on top of the substrate we obtain consistency between the temperature-dependent loss contribution and the measured hydrogen contamination.

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“…1 (see also Ref. [31]). It consists essentially of the magnet (10,11), the UHV vessel with the storage tube (9), the switch (4), and the detector (5).…”

Section: Principle Of the Experimentsmentioning

confidence: 94%

Section: Samplesmentioning

confidence: 99%

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Loss and spinflip probabilities for ultracold neutrons interacting with diamondlike carbon and beryllium surfaces

et al. 2007

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“…2 and described in detail in Ref. [73]. The first experimental results on diamond-like carbon and beryllium were published earlier [48,49].…”

Section: Methodsmentioning

confidence: 99%

Losses and depolarization of ultracold neutrons on neutron guide and storage materials

et al. 2017

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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 ∼460 s were obtained at room temperature. The corresponding loss parameters for ultracold neutrons, η, varied between 1.0 × 10 −4 and 2.2 × 10 −4 . All η 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 β measured with unprecedented sensitivity varied between 0.7 × 10 −6 and 9.0 × 10 −6 . Our depolarization result for copper differs from other experiments by 4.4 and 15.8 standard deviations. The β values of the paramagnetic NiMo alloys over molybdenum content show an increase of β 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.

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“…Refs. [4][5][6] coatings described in Ref. [5] were produced by chemical vapor deposition (CVD) using natural methane and deuterated methane as precursor gas.…”

Section: Introductionmentioning

confidence: 99%

Diamond-like carbon coated ultracold neutron guides

Heule¹,

Atchison²,

Daum³

et al. 2007

Applied Surface Science

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A novel apparatus for the investigation of material properties for the storage of ultracold neutrons

Cited by 13 publications

References 18 publications

Loss and spinflip probabilities for ultracold neutrons interacting with diamondlike carbon and beryllium surfaces

Loss and spinflip probabilities for ultracold neutrons interacting with diamondlike carbon and beryllium surfaces

Losses and depolarization of ultracold neutrons on neutron guide and storage materials

Diamond-like carbon coated ultracold neutron guides

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