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Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection.
Pattie, R W; Callahan, N B; Cude-Woods, C; Adamek, E R; Broussard, L J; Clayton, S M; Currie, S A; Dees, E B; Ding, X; Engel, E M; Fellers, D E; Fox, W; Geltenbort, P; Hickerson, K P; Hoffbauer, M A; Holley, A T; Komives, A; Liu, C-Y; MacDonald, S W T; Makela, M; Morris, C L; Ortiz, J D; Ramsey, J; Salvat, D J; Saunders, A; Seestrom, S J; Sharapov, E I; Sjue, S K; Tang, Z; Vanderwerp, J; Vogelaar, B; Walstrom, P L; Wang, Z; Wei, W; Weaver, H L; Wexler, J W; Womack, T L; Young, A R; Zeck, B A.
Afiliação
  • Pattie RW; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Callahan NB; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408, USA.
  • Cude-Woods C; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Adamek ER; Triangle Universities Nuclear Laboratory and North Carolina State University, Raleigh, NC 27695, USA.
  • Broussard LJ; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408, USA.
  • Clayton SM; Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
  • Currie SA; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Dees EB; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Ding X; Triangle Universities Nuclear Laboratory and North Carolina State University, Raleigh, NC 27695, USA.
  • Engel EM; Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
  • Fellers DE; West Point Military Academy, West Point, NY 10996, USA.
  • Fox W; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Geltenbort P; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408, USA.
  • Hickerson KP; Institut Laue-Langevin, Grenoble, France.
  • Hoffbauer MA; Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, USA.
  • Holley AT; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Komives A; Department of Physics, Tennessee Technological University, Cookeville, TN 38505, USA.
  • Liu CY; Department of Physics and Astronomy, DePauw University, Greencastle, IN 46135-0037, USA.
  • MacDonald SWT; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408, USA.
  • Makela M; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Morris CL; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Ortiz JD; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Ramsey J; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Salvat DJ; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Saunders A; Department of Physics, University of Washington, Seattle, WA 98195-1560, USA.
  • Seestrom SJ; Los Alamos National Laboratory, Los Alamos, NM 87545, USA. asaunders@lanl.gov.
  • Sharapov EI; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Sjue SK; Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia.
  • Tang Z; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Vanderwerp J; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Vogelaar B; Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408, USA.
  • Walstrom PL; Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
  • Wang Z; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Wei W; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Weaver HL; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Wexler JW; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Womack TL; Triangle Universities Nuclear Laboratory and North Carolina State University, Raleigh, NC 27695, USA.
  • Young AR; Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Zeck BA; Triangle Universities Nuclear Laboratory and North Carolina State University, Raleigh, NC 27695, USA.
Science ; 360(6389): 627-632, 2018 05 11.
Article em En | MEDLINE | ID: mdl-29731449
ABSTRACT
The precise value of the mean neutron lifetime, τn, plays an important role in nuclear and particle physics and cosmology. It is used to predict the ratio of protons to helium atoms in the primordial universe and to search for physics beyond the Standard Model of particle physics. We eliminated loss mechanisms present in previous trap experiments by levitating polarized ultracold neutrons above the surface of an asymmetric storage trap using a repulsive magnetic field gradient so that the stored neutrons do not interact with material trap walls. As a result of this approach and the use of an in situ neutron detector, the lifetime reported here [877.7 ± 0.7 (stat) +0.4/-0.2 (sys) seconds] does not require corrections larger than the quoted uncertainties.
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Texto completo: 1 Base de dados: MEDLINE Tipo de estudo: Diagnostic_studies / Prognostic_studies Idioma: En Revista: Science Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Estados Unidos
Texto completo
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Base de dados: MEDLINE Tipo de estudo: Diagnostic_studies / Prognostic_studies Idioma: En Revista: Science Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Estados Unidos