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Pattie, R.W.; Adamek, E.R.; Brenner, T.; Brandt, A.; Broussard, L.J.; Callahan, N.B.; Clayton, S.M.; Cude-Woods, C.; Currie, S.A.; Geltenbort, P.; Ito, T.M.; Lauer, T.; Liu, C.Y.; Majewski, J.; Makela, M.; Masuda, Y.; Morris, C.L.; Ramsey, J.C.; Salvat, D.J.; Saunders, A.; Schroffenegger, J.; Tang, Z.; Wei, W.; Wang, Z.; Watkins, E.; Young, A.R.; Zeck, B.A.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 11/2017, Letnik: 872Journal Article
We report on the evaluation of commercial electroless nickel phosphorus (NiP) coatings for ultracold neutron (UCN) transport and storage. The material potential of 50μm thick NiP coatings on stainless steel and aluminum substrates was measured to be VF=213(5.2) neV using the time-of-flight spectrometer ASTERIX at the Lujan Center. The loss per bounce probability was measured in pinhole bottling experiments carried out at ultracold neutron sources at Los Alamos Neutron Science Center and the Institut Laue-Langevin. For these tests a new guide coupling design was used to minimize gaps between the guide sections. The observed UCN loss in the bottle was interpreted in terms of an energy independent effective loss per bounce, which is the appropriate model when gaps in the system and upscattering are the dominate loss mechanisms, yielding a loss per bounce of 1.3(1)×10−4. We also present a detailed discussion of the pinhole bottling methodology and an energy dependent analysis of the experimental results.
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in: SICRIS
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