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Total cross sections for ultracold neutrons scattered from gases

Seestrom, S. J. and Hickerson, K. P. (2017) Total cross sections for ultracold neutrons scattered from gases. Physical Review C, 95 (1). Art. No. 015501. ISSN 2469-9985.

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We have followed up on our previous measurements of upscattering of ultracold neutrons (UCNs) from a series of gases by making measurements of total cross sections on the following gases hydrogen, ethane, methane, isobutene, n-butane, ethylene, water vapor, propane, neopentane, isopropyl alcohol, and ^3He. The values of these cross sections are important for estimating the loss rate of trapped neutrons due to residual gas and are relevant to neutron lifetime measurements using UCNs. The effects of the UCN velocity and path-length distributions were accounted for in the analysis using a Monte Carlo transport code. Results are compared to our previous measurements and with the known absorption cross section for ^3He scaled to our UCN energy. We find that the total cross sections for the hydrocarbon gases are reasonably described by a function linear in the number of hydrogen atoms in the molecule.

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Hickerson, K. P.0000-0001-7647-119X
Additional Information:© 2017 American Physical Society. Received 12 July 2016; published 30 January 2017. This material is supported by the LANL LDRD program, the U.S. Department of Energy Office of Science, Office of Nuclear Physics through LANL DOE Grant No. 2015LANLE9BU and North Carolina State University Grant No. DE-FG02-97ER41042, the U.S. National Science Foundation through Indiana University Grants No. PHY-0969490 and No. PHY-1068712, and North Carolina State University grant NSF Grant No. 1307426.
Funding AgencyGrant Number
Los Alamos National Laboratory (LANL)UNSPECIFIED
Department of Energy (DOE)2015LANLE9BU
Department of Energy (DOE)DE-FG02-97ER41042
Issue or Number:1
Record Number:CaltechAUTHORS:20170130-133127545
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73824
Deposited By: Tony Diaz
Deposited On:30 Jan 2017 21:44
Last Modified:09 Mar 2020 13:18

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