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Selected Works of Robert W. Pattie Jr.
Article
Performance of the Upgraded Ultracold Neutron Source at Los Alamos National Laboratory and Its Implication for a Possible Neutron Electric Dipole Moment Experiment
Physical Review C (2018)
  • Takeyasu M. Ito, Los Alamos National Laboratory
  • Evan R. Adamek, Indiana University
  • Nathan B. Callahan, Indiana University
  • J. H. Choi, North Carolina State University
  • Stephen M. Clayton, Los Alamos National Laboratory
  • Chris Cude-Woods, Los Alamos National Laboratory
  • Scott Currie, Los Alamos National Laboratory
  • Xinjian Ding, Virginia Polytechnic Institute and State University
  • D. E. Fellers, Los Alamos National Laboratory
  • Peter Geltenbort, Institut Laue-Langevin
  • Steve K. Lamoreaux, Yale University
  • C. Y. Liu, Los Alamos National Laboratory
  • S. MacDonald, Los Alamos National Laboratory
  • Mark Makela, Los Alamos National Laboratory
  • Charles L. Morris, Los Alamos National Laboratory
  • Robert W. Pattie, Jr., Los Alamos National Laboratory
  • John Clinton Ramsey, Los Alamos National Laboratory
  • Daniel J. Salvat, Indiana University
  • Andy Saunders, Los Alamos National Laboratory
  • Edward I. Sharapov, Joint Institute of Nuclear Research
  • S. Sjue, Los Alamos National Laboratory
  • A. P. Sprow, University of Kentucky
  • Zebo Tang, Los Alamos National Laboratory
  • H. L. Weaver, Los Alamos National Laboratory
  • Wanchun Wei, Los Alamos National Laboratory
  • Andrew R. Young, North Carolina State University
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Abstract
The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various experiments, as the first production UCN source based on the superthermal process. It has recently undergone a major upgrade. This paper describes the design and performance of the upgraded LANL UCN source. Measurements of the cold neutron spectrum and UCN density are presented and compared to Monte Carlo predictions. The source is shown to perform as modeled. The UCN density measured at the exit of the biological shield was 184(32) UCN/cm3, a fourfold increase from the highest previously reported. The polarized UCN density stored in an external chamber was measured to be 39(7) UCN/cm3, which is sufficient to perform an experiment to search for the nonzero neutron electric dipole moment with a one-standard-deviation sensitivity of σ(dn)=3×10−27ecm.
Keywords
  • Performance,
  • Upgraded Ultracold Neutron,
  • Los Alamos,
  • Los Alamos National Laboratory,
  • Neutron Electric Dipole
Disciplines
Publication Date
January 29, 2018
DOI
10.1103/physrevc.97.012501
Publisher Statement
©2018 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
Takeyasu M. Ito, Evan R. Adamek, Nathan B. Callahan, J. H. Choi, et al.. "Performance of the Upgraded Ultracold Neutron Source at Los Alamos National Laboratory and Its Implication for a Possible Neutron Electric Dipole Moment Experiment" Physical Review C Vol. 97 Iss. 1 (2018) ISSN: 2469-9985
Available at: http://works.bepress.com/robert-pattie/4/