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Selected Works of Robert W. Pattie Jr.
Article
Measurement of the Neutron -Asymmetry Parameter a0 with Ultracold Neutrons
Physical Review C (2012)
  • Bradley Plaster, University of Kentucky
  • R. Rios, Los Alamos National Laboratory
  • Thomas J. Bowles, Los Alamos National Laboratory
  • Leah J. Broussard, Duke University
  • Richard Carr, California Institute of Technology
  • Steven Clayton, Los Alamos National Laboratory
  • Scott Currie, Los Alamos National Laboratory
  • Bradley W. Filippone, California Institute of Technology
  • Peter Geltenbort, Institut Laue-Langevin
  • Kevin P. Hickerson, California Institute of Technology
  • J. Todd Hoagland, North Carolina State University
  • Gary E. Hogan, Los Alamos National Laboratory
  • B. Hona, University of Kentucky
  • Anthoney T. Holley, North Carolina State University
  • Takeyasu M. Ito, California Institute of Technology
  • ChenYu Liu, Indiana University
  • Jingyang Liu, California Institute of Technology
  • Mark Makela, Los Alamos National Laboratory
  • J. W. Martin, California Institute of Technology
  • Daniel Melconian, West Texas A&M University
  • Michael P. Mendenhall, California Institute of Technology
  • Charles L. Morris, Los Alamos National Laboratory
  • R. Mortensen, Los Alamos National Laboratory
  • Robert W. Pattie, North Carolina State University
  • Margaret L. Pitt, Virginia Tech
  • John C. Ramsey, Los Alamos National Laboratory
  • R. Russell, California Institute of Technology
  • Andy Saunders, Los Alamos National Laboratory
  • R. Schmid, California Institute of Technology
  • Susan J. Seestrom, Los Alamos National Laboratory
  • Sky Sjue, University of Washington
  • Walter E. Sondheim, Los Alamos National Laboratory
  • E. Tatar, Idaho State University
  • B. Tipton, California Institute of Technology
  • Robert B. Vogelaar, Virginia Tech
  • Brittany VornDick, North Carolina State University
  • Christopher Wrede, University of Washington
  • Y. P. Xu, North Carolina State University
  • H. Yan, University of Kentucky
  • Andrew R. Young, North Carolina State University
  • J. Yuan, North Carolina State University
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Abstract
We present a detailed report of a measurement of the neutron β-asymmetry parameter A0, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2 × 2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A0 = −0.11966 ± 0.00089 +0.00123 0.00140 , from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ = gA/gV = −1.27590 ± 0.00239 +0.00331 0.00377. Complete details of the analysis are presented.
Keywords
  • Measurement,
  • Neutron -Asymmetry Parameter,
  • Ultracold Neutrons
Disciplines
Publication Date
January 1, 2012
Publisher Statement
©2012 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
Bradley Plaster, R. Rios, Thomas J. Bowles, Leah J. Broussard, et al.. "Measurement of the Neutron -Asymmetry Parameter a0 with Ultracold Neutrons" Physical Review C (2012) ISSN: 2469-9985
Available at: http://works.bepress.com/robert-pattie/22/