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First Observation of P-odd γ Asymmetry in Polarized Neutron Capture on Hydrogen.

  • Blyth D Arizona State University, Tempe, Arizona 85287, USA.
  • Fry J University of Virginia, Charlottesville, Virginia 22904, USA.
  • Fomin N University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Alarcon R Arizona State University, Tempe, Arizona 85287, USA.
  • Alonzi L University of Virginia, Charlottesville, Virginia 22904, USA.
  • Askanazi E University of Virginia, Charlottesville, Virginia 22904, USA.
  • Baeßler S University of Virginia, Charlottesville, Virginia 22904, USA.
  • Balascuta S Arizona State University, Tempe, Arizona 85287, USA.
  • Barrón-Palos L Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000, Mexico.
  • Barzilov A University of Nevada, Las Vegas, Nevada 89154, USA.
  • Bowman JD Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Birge N University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Calarco JR University of New Hampshire, Durham, New Hampshire 03824, USA.
  • Chupp TE University of Michigan, Ann Arbor, Michigan 48109, USA.
  • Cianciolo V Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Coppola CE University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Crawford CB University of Kentucky, Lexington, Kentucky 40506, USA.
  • Craycraft K University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Evans D University of Virginia, Charlottesville, Virginia 22904, USA.
  • Fieseler C University of Kentucky, Lexington, Kentucky 40506, USA.
  • Frlež E University of Virginia, Charlottesville, Virginia 22904, USA.
  • Garishvili I University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Gericke MTW University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.
  • Gillis RC Indiana University, Bloomington, Indiana 47405, USA.
  • Grammer KB University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Greene GL University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Hall J University of Virginia, Charlottesville, Virginia 22904, USA.
  • Hamblen J University of Tennessee, Chattanooga, Tennessee 37403 USA.
  • Hayes C University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Iverson EB Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Kabir ML University of Kentucky, Lexington, Kentucky 40506, USA.
  • Kucuker S University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Lauss B Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
  • Mahurin R Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA.
  • McCrea M University of Kentucky, Lexington, Kentucky 40506, USA.
  • Maldonado-Velázquez M Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000, Mexico.
  • Masuda Y High Energy Accelerator Research Organization (KEK), Tukuba-shi, 305-0801, Japan.
  • Mei J Indiana University, Bloomington, Indiana 47405, USA.
  • Milburn R University of Kentucky, Lexington, Kentucky 40506, USA.
  • Mueller PE Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Musgrave M University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Nann H Indiana University, Bloomington, Indiana 47405, USA.
  • Novikov I Western Kentucky University, Bowling Green, Kentucky 42101, USA.
  • Parsons D University of Tennessee, Chattanooga, Tennessee 37403 USA.
  • Penttilä SI Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Počanić D University of Virginia, Charlottesville, Virginia 22904, USA.
  • Ramirez-Morales A Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000, Mexico.
  • Root M University of Virginia, Charlottesville, Virginia 22904, USA.
  • Salas-Bacci A University of Virginia, Charlottesville, Virginia 22904, USA.
  • Santra S Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
  • Schröder S University of Virginia, Charlottesville, Virginia 22904, USA.
  • Scott E University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Seo PN University of Virginia, Charlottesville, Virginia 22904, USA.
  • Sharapov EI Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Simmons F University of Kentucky, Lexington, Kentucky 40506, USA.
  • Snow WM Indiana University, Bloomington, Indiana 47405, USA.
  • Sprow A University of Kentucky, Lexington, Kentucky 40506, USA.
  • Stewart J University of Tennessee, Chattanooga, Tennessee 37403 USA.
  • Tang E Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Tang Z Indiana University, Bloomington, Indiana 47405, USA.
  • Tong X Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Turkoglu DJ National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
  • Whitehead R University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Wilburn WS Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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  • 2019-01-05
Published in:
  • Physical review letters. - 2018
General Physics and Astronomy
English We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{γ}^{np} isolates the ΔI=1, ^{3}S_{1}→^{3}P_{1} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory. We measured A_{γ}^{np}=[-3.0±1.4(stat)±0.2(syst)]×10^{-8}, which implies a DDH weak πNN coupling of h_{π}^{1}=[2.6±1.2(stat)±0.2(syst)]×10^{-7} and a pionless EFT constant of C^{^{3}S_{1}→^{3}P_{1}}/C_{0}=[-7.4±3.5(stat)±0.5(syst)]×10^{-11}  MeV^{-1}. We describe the experiment, data analysis, systematic uncertainties, and implications of the result.
Language
  • English
Open access status
hybrid
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https://sonar.ch/global/documents/933
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