Simultaneity in the Compton Effect

Abstract

The simultaneity in the Compton effect has been investigated by using scintillation counters and fast coincidence techniques. By the use of a gamma-ray source of a known, very short, lifetime (${\mathrm{Ni}}^{60}$) it was possible to apply a first moment investigation to the time delays involved.It is shown that the order of magnitude of all possible time delays involved in the Compton effect does not exceed ${10}^{\ensuremath{-}11}$ second. Upper limits previously given were \ensuremath{\sim}${10}^{\ensuremath{-}8}$ second.