Radiative Corrections in the Angular Correlation of Monopole Pairs from ${\mathrm{O}}^{16}$ at Small Angles

The angular correlation of electron-positron pair emission in the $0^{+}$→$0^{+}$ transition in ${\mathrm{O}}^{16}$ was investigated for very small angles. An enhancement of several percent in the emission rate at these small angles is expected, due to first-order radiative corrections represented principally by the vertex graph. The rapid rise in the correlation at small angles was experimentally verified, and the results are in agreement with the theory.