Asymmetry of Beta-Ray Angular Distribution in Polarized Nuclei andG-Parity Nonconservation

Abstract

We have derived an equation for the $\beta$-ray angular distribution including Coulomb corrections, radiative corrections, induced effect, and higher-order nuclear matrices. With this equation and the experimental data on $\beta$-ray asymmetries in polarized ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{N}$, we conclude that the strength of the second-class induced tensor is $\frac{f_T}{f_A}=-(0.96\mathrm{}\pm 0.35)\times {10}^{-3\mathrm{}}$ in the limit of the impulse approximation. A possible modification of this value due to mesonic corrections is discussed.