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First Observation of P-odd γ Asymmetry in Polarized Neutron Capture on Hydrogen.
Blyth, D; Fry, J; Fomin, N; Alarcon, R; Alonzi, L; Askanazi, E; Baeßler, S; Balascuta, S; Barrón-Palos, L; Barzilov, A; Bowman, J D; Birge, N; Calarco, J R; Chupp, T E; Cianciolo, V; Coppola, C E; Crawford, C B; Craycraft, K; Evans, D; Fieseler, C; Frlez, E; Garishvili, I; Gericke, M T W; Gillis, R C; Grammer, K B; Greene, G L; Hall, J; Hamblen, J; Hayes, C; Iverson, E B; Kabir, M L; Kucuker, S; Lauss, B; Mahurin, R; McCrea, M; Maldonado-Velázquez, M; Masuda, Y; Mei, J; Milburn, R; Mueller, P E; Musgrave, M; Nann, H; Novikov, I; Parsons, D; Penttilä, S I; Pocanic, D; Ramirez-Morales, A; Root, M; Salas-Bacci, A; Santra, S.
Afiliação
  • Blyth D; Arizona State University, Tempe, Arizona 85287, USA.
  • Fry J; High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • Fomin N; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Alarcon R; Indiana University, Bloomington, Indiana 47405, USA.
  • Alonzi L; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Askanazi E; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Baeßler S; Arizona State University, Tempe, Arizona 85287, USA.
  • Balascuta S; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Barrón-Palos L; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Barzilov A; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Bowman JD; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Birge N; Arizona State University, Tempe, Arizona 85287, USA.
  • Calarco JR; Horia Hulubei National Institute for Physics and Nuclear Engineering, Magurele 077125, Romania.
  • Chupp TE; Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000, Mexico.
  • Cianciolo V; University of Nevada, Las Vegas, Nevada 89154, USA.
  • Coppola CE; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Crawford CB; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Craycraft K; University of New Hampshire, Durham, New Hampshire 03824, USA.
  • Evans D; University of Michigan, Ann Arbor, Michigan 48109, USA.
  • Fieseler C; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Frlez E; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Garishvili I; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Gericke MTW; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Gillis RC; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Grammer KB; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Greene GL; Indiana University, Bloomington, Indiana 47405, USA.
  • Hall J; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Hamblen J; University of Virginia, Charlottesville, Virginia 22904, 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 Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.
  • Kucuker S; Indiana University, Bloomington, Indiana 47405, USA.
  • Lauss B; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Mahurin R; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • McCrea M; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Maldonado-Velázquez M; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Masuda Y; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Mei J; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Milburn R; University of Tennessee, Chattanooga, Tennessee 37403 USA.
  • Mueller PE; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Musgrave M; Physics Department, North Carolina State University, Raleigh, North Carolina 27695, USA.
  • Nann H; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Novikov I; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Parsons D; Mississippi State University, Mississippi State, Mississippi 39759, USA.
  • Penttilä SI; University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Pocanic D; Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.
  • Ramirez-Morales A; Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
  • Root M; Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA.
  • Salas-Bacci A; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Santra S; University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.
Phys Rev Lett ; 121(24): 242002, 2018 Dec 14.
Article em En | MEDLINE | ID: mdl-30608729
ABSTRACT
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.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Estados Unidos
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Estados Unidos