Determination of the axial-vector weak coupling constant with ultracold neutrons

J. Liu, M. P. Mendenhall, A. T. Holley, H. O. Back, T. J. Bowles, L. J. Broussard, R. Carr, S. Clayton, S. Currie, B. W. Filippone, A. García, P. Geltenbort, K. P. Hickerson, J. Hoagland, G. E. Hogan, B. Hona, T. M. Ito, C. Y. Liu, M. Makela, R. R. MammeiJ. W. Martin, D. Melconian, C. L. Morris, R. W. Pattie, A. Pérez Galván, M. L. Pitt, B. Plaster, J. C. Ramsey, R. Rios, R. Russell, A. Saunders, S. J. Seestrom, W. E. Sondheim, E. Tatar, R. B. Vogelaar, B. Vorndick, C. Wrede, H. Yan, A. R. Young

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


A precise measurement of the neutron decay β asymmetry A0 has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A0=-0.11966±0.00089-0.00140+0. 00123, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon gA/gV=-1.27590-0.00445+0.00409.

Original languageEnglish
Article number181803
JournalPhysical Review Letters
Issue number18
StatePublished - 2010

ASJC Scopus subject areas

  • General Physics and Astronomy


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