Internal Pair Formation

Abstract

The electron-positron angular correlation and total conversion coefficient are calculated for internal pair formation and for arbitrary multipole order of the electric and magnetic radiation fields. The Born approximation is used and in the region of greatest experimental interest, $Z\ensuremath{\lesssim}40$ and gamma-ray energy>2.5 Mev, the consequent error should be negligible. Numerical results are given for multipole fields of order ${2}^{l}$ with $l=1$ through 5 inclusive.