Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

Abstract

A precise measurement of the neutron decay $\beta$-asymmetry $A_0$ has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos Neutron Science Center (LANSCE). Combining data obtained in 2008 and 2009, we report $A_0=-0.11966\pm 0.00089_{-0.00140}^{+0.00123}$, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon $g_A/g_V=-1.27590_{-0.00445}^{+0.00409}$.

5 pages, 2 figures

References in corpus (4)

• Improved Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant
• First Measurement of the Neutron $\beta$-Asymmetry with Ultracold Neutrons
• A solenoidal electron spectrometer for a precision measurement of the neutron $\beta$-asymmetry with ultracold neutrons
• A Multiwire Proportional Chamber for Precision Studies of Neutron Beta Decay Angular Correlations

Cited by in corpus (2)

• Chiral effective field theory and nuclear forces
• The Reactor Antineutrino Anomaly