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Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium

Sharapov, E. I. and Hickerson, K. P. and Mendenhall, M. P. (2013) Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium. Physical Review C, 88 (3). Art. No. 037601. ISSN 0556-2813.

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The study of neutron cross sections for elements used as efficient “absorbers” of ultracold neutrons (UCN) is crucial for many precision experiments in nuclear and particle physics, cosmology and gravity. In this context, “absorption” includes both the capture and upscattering of neutrons to the energies above the UCN energy region. The available data, especially for hydrogen, do not agree between themselves or with the theory. In this report we describe measurements performed at the Los Alamos National Laboratory UCN facility of the UCN upscattering cross sections for vanadium and for hydrogen in CH_2 using simultaneous measurements of the radiative capture cross sections for these elements. We measured σ_(up)=1972±130 b for hydrogen in CH_2, which is below theoretical expectations, and σ_(up)=25±9 b for vanadium, in agreement with the expectation for the neutron heating by thermal excitations in solids.

Item Type:Article
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URLURL TypeDescription Paper DOIArticle
Hickerson, K. P.0000-0001-7647-119X
Additional Information:Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 5 June 2013; revised manuscript received 24 July 2013; published 3 September 2013. This work was performed under the auspices of the US Department of Energy under Contract No. DE-AC52- 06NA25396. D.J.S. is supported by the DOE Office of Science Graduate Fellowship Program (DOE SCGF), made possible in part by the American Recovery and Reinvestment Act of 2009, administered by ORISE-ORAU under contract no. DE-AC05-06OR23100.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC52-06NA25396
Department of Energy (DOE) Office of Science Graduate Fellowship Program (SCGF)UNSPECIFIED
American Recovery and Reinvestment Act (ARRA)UNSPECIFIED
Issue or Number:3
Classification Code:PACS: 25.40.Fq, 25.40.Kv, 28.20.Ka
Record Number:CaltechAUTHORS:20131004-145935167
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41691
Deposited By: Tony Diaz
Deposited On:04 Oct 2013 22:42
Last Modified:09 Mar 2020 13:18

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