Angular Correlations of Coincident Electron-Positron Pairs Produced in Heavy-Ion Collisions with Nuclear Time Delay

We calculate angular correlations between coincident electron-positron pairs emitted in heavy-ion collisions with nuclear time delay. Special attention is directed to a comparison of supercritical and subcritical systems, where angular correlations of pairs produced in collisions of bare U nuclei are found to alter their sign for nuclear delay times of the order of 2 × ${10}^{-21\mathrm{}}$ s. This effect is shown to occur exclusively in supercritical systems, where spontaneous positron creation is active.