Nab: Measurement principles, apparatus and uncertainties

Dinko Počanić, R. Alarcon, L. P. Alonzi, S. Baeßler, S. Balascuta, J. D. Bowman, M. A. Bychkov, J. Byrne, J. R. Calarco, V. Cianciolo, C. Crawford, E. Frlež, M. T. Gericke, G. L. Greene, R. K. Grzywacz, V. Gudkov, F. W. Hersman, A. Klein, J. Martin, S. A. PageA. Palladino, S. I. Penttilä, K. P. Rykaczewski, W. S. Wilburn, A. R. Young, G. R. Young

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


The Nab collaboration will perform a precise measurement of a, the electron-neutrino correlation parameter, and b, the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10- 3 accuracy level in Δ a / a, and will provide an independent measurement of λ = GA / GV, the ratio of axial-vector to vector coupling constants of the nucleon. Nab also plans to perform the first ever measurement of b in neutron decay, which will provide an independent limit on the tensor weak coupling.

Original languageEnglish
Pages (from-to)211-215
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
StatePublished - Dec 1 2009


  • Correlations
  • Neutron beta decay
  • Precision measurement

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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