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Related Experiment Video

Updated: Feb 9, 2026

Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids
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Neutron Lifetime and Axial Coupling Connection.

Andrzej Czarnecki1, William J Marciano2, Alberto Sirlin3

  • 1Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E1.

Physical Review Letters
|June 5, 2018
PubMed
Summary
This summary is machine-generated.

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Neutron decay studies reveal discrepancies in neutron lifetime and axial coupling measurements. This research favors values from trapped ultracold neutron experiments, suggesting a new constraint on exotic neutron decay.

Area of Science:

  • Particle Physics
  • Nuclear Physics

Background:

  • Experimental neutron decay studies present two anomalies: a discrepancy in neutron lifetime measurements (beam vs. trapped ultracold neutrons) and a difference in axial coupling values (pre- and post-2002).
  • These anomalies suggest potential issues in understanding fundamental neutron decay processes.

Purpose of the Study:

  • To correlate neutron lifetime (τn) and axial coupling (gA) values using an updated relation.
  • To establish preferred values for τn and gA based on consistency and precision.
  • To compare derived gA values with theoretical predictions and constrain exotic neutron decay.

Main Methods:

  • Utilized the relation τn(1+3gA²) = 5172.0(1.1) s to correlate experimental data.
  • Analyzed and compared neutron lifetime and axial coupling data from beam and trapped ultracold neutron experiments.

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  • Evaluated consistency between experimental results and theoretical models, including lattice QCD.

    • Main Results:

    • Identified preferred values for neutron lifetime as τn = 879.4(6) s and axial coupling as gA = 1.2755(11).
    • These preferred values align with results from trapped ultracold neutron experiments and post-2002 asymmetry measurements.
    • Derived a constraint on exotic neutron decay branching ratios, setting an upper limit of <0.27%.

    Conclusions:

    • The study favors τn = 879.4(6) s and gA = 1.2755(11) as the most consistent and precise parameters for neutron decay.
    • The findings provide a new constraint on exotic neutron decay, impacting proposed solutions to the neutron lifetime puzzle.
    • Further research comparing gA with lattice QCD and muonic hydrogen capture is warranted.