Double Positron-electron Pair Production, an Interaction of Electromagnetic Radiation with Matter

Abstract

<p>The task of detection and measurement of the instantaneous process of double positron-electron pair production was undertaken. Several targets of different atomic number were used, in conjunction with 6.6-MeV gamma rays, to isolate the process from the interfering two-pair processes known as the bremsstrahlung-cascade and the direct-cascade effects. A quantitatively significant value has been determined for the cross section for double pair production relative to that for single pair production.</p>