Precision Measurement of the Neutron Beta-Decay Asymmetry

Abstract

A new measurement of the neutron $\beta$-decay asymmetry $A_0$ has been carried out by the UCNA collaboration using polarized ultracold neutrons (UCN) from the solid deuterium UCN source at the Los Alamos Neutron Science Center (LANSCE). Improvements in the experiment have led to reductions in both statistical and systematic uncertainties leading to $A_0=-0.11954(55{)}_{stat.}(98{)}_{syst.}$, corresponding to the ratio of axial-vector to vector coupling $\lambda \equiv g_A/g_V=-1.2756(30)$.

References in corpus (5)

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