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The angular distribution of electrons and positrons emitted in internal pair conversion is calculated. Coulomb-distorted waves are used as electron wave functions. Nuclear transitions of various multipolarities {ital L}{gt}0 and of magnetic (ML) and of electric (EL) type are considered as well as {ital E}0 conversion. Analytical expressions for the angular correlation are derived, which are evaluated numerically assuming a finite extension of the nucleus and, for the EL and ML conversion, also in the point-nucleus approximation. The calculated angular correlations are compared with results obtained within the Born approximation and, for the {ital E}0 case, with experimental data.

Angular correlation of electrons and positrons in internal pair conversion