Measurement of Angular Correlations in the Decay of Polarized Neutrons

The electron-momentum-neutron-spin correlation coefficient was found to be $A=-0.115\mathrm{}\pm 0.008$, and the antineutrino-momentum-neutron-spin correlation coefficient was found to be $B=1.00\mathrm{}\pm 0.05$. The value of $A$ leads to $\left|\frac{G_A}{G_V}\right|=1.26\mathrm{}\pm 0.02$ for the ratio of Gamow-Teller-to-Fermi coupling constants in $\beta$ decay, and $B$ is consistent with zero scalar or tensor interaction.