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Selected Works of Robert W. Pattie Jr.
Article
Measurements of Ultracold Neutron Upscattering and Absorption in Polyethylene and Vanadium
Physical Review C (2013)
  • Eduard I. Sharapov, Joint Institute for Nuclear Research
  • Charles L. Morris, Los Alamos National Laboratory
  • Mark Makela, Los Alamos National Laboratory
  • Andy Saunders, Los Alamos National Laboratory
  • Evan R. Adamek, Indiana University
  • Yelena Bagdasarova, Los Alamos National Laboratory
  • Leah J. Broussard, Los Alamos National Laboratory
  • Chris Cude-Woods, Indiana University
  • Deon E Fellers, Los Alamos National Laboratory
  • Peter Geltenbort, Institut Laue-Langevin
  • Siraj I. Hasan, University of Kentucky
  • Kevin P. Hickerson, Kellogg Radiation Laboratory
  • Gary Hogan, Los Alamos National Laboratory
  • Anthony T. Holley, Indiana University
  • Chen-Yu Liu, Indiana University
  • Michael P. Mendenhall, California Institute of Technology
  • Jose Ortiz, Los Alamos National Laboratory
  • Robert W. Pattie, Jr., North Carolina State University
  • David G. Phillips, North Carolina State University
  • John Ramsey, Los Alamos National Laboratory
  • D. J. Salvat, Indiana University
  • Susan J. Seestrom, Los Alamos National Laboratory
  • E. Shaw, Los Alamos National Laboratory
  • Sky Sjue, Los Alamos National Laboratory
  • Walter E. Sondheim, Los Alamos National Laboratory
  • Brittany VornDick, North Carolina State University
  • Zhehui Wang, Los Alamos National Laboratory
  • Tanner L. Womack, Los Alamos National Laboratory
  • Andrew R. Young, North Carolina State University
  • B. A. Zeck, North Carolina State University
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Abstract
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 CH2 using simultaneous measurements of the radiative capture cross sections for these elements. We measured σup=1972±130 b for hydrogen in CH2, which is below theoretical expectations, and σup=25±9 b for vanadium, in agreement with the expectation for the neutron heating by thermal excitations in solids.
Keywords
  • Measurements,
  • Ultracold Neutron Upscattering,
  • Absorption,
  • Polyethylene and Vanadium.
Disciplines
Publication Date
September 3, 2013
DOI
10.1103/PhysRevC.88.037601
Publisher Statement
©2013 American Physical Society. Authors have the nonexclusive right to post the APS-prepared version of the article to an institutional repository. This document was originally published in Physical Review C.
Citation Information
Eduard I. Sharapov, Charles L. Morris, Mark Makela, Andy Saunders, et al.. "Measurements of Ultracold Neutron Upscattering and Absorption in Polyethylene and Vanadium" Physical Review C Vol. 88 Iss. 3 (2013) p. 037601 ISSN: 2469-9985
Available at: http://works.bepress.com/robert-pattie/17/