Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces

Tang, Zhaowen; Adamek, Evan Robert; Brandt, Aaron; Callahan, Nathan Brannan; Clayton, Steven M.; Currie, Scott Allister; Ito, Takeyasu M.; Makela, Mark F.; Masuda, Yasuhiro; Morris, Christopher L.; Pattie, Robert Wayne; Ramsey, John Clinton; Salvat, Daniel J.; Saunders, Alexander; Young, Albert R.

doi:10.1016/j.nima.2016.04.098

Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces

Journal Article · Tue Apr 26 00:00:00 EDT 2016 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2016.04.098· OSTI ID:1335603

Tang, Zhaowen ^[1]; Adamek, Evan Robert ^[2]; Brandt, Aaron ^[3]; Callahan, Nathan Brannan ^[2]; Clayton, Steven M. ^[1]; Currie, Scott Allister ^[1]; Ito, Takeyasu M. ^[1]; Makela, Mark F. ^[1]; Masuda, Yasuhiro ^[4]; ^[1]; Pattie, Robert Wayne ^[1]; Ramsey, John Clinton ^[1]; Salvat, Daniel J. ^[5]; Saunders, Alexander ^[1]; Young, Albert R. ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Indiana Univ., Bloomington, IN (United States)
North Carolina State Univ., Raleigh, NC (United States)
High Energy Accelerator Research Organization, Tsukuba (Japan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indiana Univ., Bloomington, IN (United States)

In this paper, we report a measurement of the spin-flip probabilities for ultracold neutrons interacting with surfaces coated with nickel phosphorus. For 50 μm thick nickel phosphorus coated on stainless steel, the spin-flip probability per bounce was found to be β_{NiP on SS} = (3.3 +1.8, -5.6) X 10^-6. For 50 μm thick nickel phosphorus coated on aluminum, the spin-flip probability per bounce was found to be β_{NiP on Al} = (3.6 +2.1, -5.9) X 10^-6. For the copper guide used as reference, the spin flip probability per bounce was found to be β_Cu = (6.7 + 5.0, -2.5) X 10^-6. The results on the nickel phosphorus-coated surfaces may be interpreted as upper limits, yielding β_{NiP on SS} < 6.2 X 10^-6 (90% C.L.) and β_{NiP on Al} < 7.0 X 10^-6 (90% C.L.) for 50 μm thick nickel phosphorus coated on stainless steel and 50 μm thick nickel phosphorus coated on aluminum, respectively. Finally, nickel phosphorus coated stainless steel or aluminum provides a solution when low-cost, mechanically robust, and non-depolarizing UCN guides with a high Fermi potential are needed.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program

Contributing Organization:: High Energy Accelerator Research Organization, Tsukuba (Japan); Indiana Univ., Bloomington, IN (United States); North Carolina State Univ., Raleigh, NC (United States)

Grant/Contract Number:: AC05-00OR22725; AC52-06NA25396

OSTI ID:: 1335603

Alternate ID(s):: OSTI ID: 1481653

Report Number(s):: LA-UR--15-28097

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 827; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces

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