Using Nab to determine correlations in unpolarized neutron decay

L. J. Broussard, S. Baeßler, T. L. Bailey, N. Birge, J. D. Bowman, C. B. Crawford, C. Cude-Woods, D. E. Fellers, N. Fomin, E. Frlež, M. T.W. Gericke, L. Hayen, A. P. Jezghani, H. Li, N. Macsai, M. F. Makela, R. R. Mammei, D. Mathews, P. L. McGaughey, P. E. MuellerD. Počanić, C. A. Royse, A. Salas-Bacci, S. K.L. Sjue, J. C. Ramsey, N. Severijns, E. C. Smith, J. Wexler, R. A. Whitehead, A. R. Young, B. A. Zeck

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The Nab experiment will measure the ratio of the weak axial-vector and vector coupling constants λ = gA/gV with precision δλ/λ ∼ 3 × 10− 4 and search for a Fierz term bF at a level ΔbF < 10− 3. The Nab detection system uses thick, large area, segmented silicon detectors to very precisely determine the decay proton’s time of flight and the decay electron’s energy in coincidence and reconstruct the correlation between the antineutrino and electron momenta. Excellent understanding of systematic effects affecting timing and energy reconstruction using this detection system are required. To explore these effects, a series of ex situ studies have been undertaken, including a search for a Fierz term at a less sensitive level of ΔbF < 10− 2 in the beta decay of 45Ca using the UCNA spectrometer.

Original languageEnglish
Article number1
JournalHyperfine Interactions
Issue number1
StatePublished - Jun 1 2019

Bibliographical note

Publisher Copyright:
© 2018, Springer Nature Switzerland AG.


  • Beta spectrum
  • Neutron beta decay
  • Nuclear beta decay
  • Silicon detector

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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