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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4] ; ORCiD logo [1] ;  [1] ;  [1] ;  [5] ;  [1] ;  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Indiana Univ., Bloomington, IN (United States)
  3. North Carolina State Univ., Raleigh, NC (United States)
  4. High Energy Accelerator Research Organization, Tsukuba (Japan)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indiana Univ., Bloomington, IN (United States)
Publication Date:
Report Number(s):
LA-UR-15-28097
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC52-06NA25396; 20140015DR
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 827; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Contributing Orgs:
Indiana Univ., Bloomington, IN (United States); North Carolina State Univ., Raleigh, NC (United States); High Energy Accelerator Research Organization, Tsukuba (Japan)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; Atomic and Nuclear Physics; Ultracold neutron; Ultracold neutron guide; Spin depolarization; Nickel phosphorus
OSTI Identifier:
1335603

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, and Young, Albert R.. Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces. United States: N. p., Web. doi:10.1016/j.nima.2016.04.098.
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.. Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces. United States. doi:10.1016/j.nima.2016.04.098.
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, and Young, Albert R.. 2016. "Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces". United States. doi:10.1016/j.nima.2016.04.098. https://www.osti.gov/servlets/purl/1335603.
@article{osti_1335603,
title = {Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces},
author = {Tang, Zhaowen and Adamek, Evan Robert and Brandt, Aaron and Callahan, Nathan Brannan and Clayton, Steven M. and Currie, Scott Allister and Ito, Takeyasu M. and Makela, Mark F. and Masuda, Yasuhiro and Morris, Christopher L. and Pattie, Robert Wayne and Ramsey, John Clinton and Salvat, Daniel J. and Saunders, Alexander and Young, Albert R.},
abstractNote = {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 βNiP 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 βNiP 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 βCu = (6.7 + 5.0, -2.5) X 10-6. The results on the nickel phosphorus-coated surfaces may be interpreted as upper limits, yielding βNiP on SS < 6.2 X 10-6 (90% C.L.) and βNiP 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.},
doi = {10.1016/j.nima.2016.04.098},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 827,
place = {United States},
year = {2016},
month = {4}
}