Evidence for the Presence ofE0in Direct Competition withM1andE2

Abstract

Gamma-electron and electron-gamma angular directional correlation measurements have been obtained for the 334.0-356.5 kev cascade in ${\mathrm{Pt}}^{196}$ by use of a beta-spectrometer and a NaI(Tl) scintillation detector. The result obtained for the ${\overline{A}}_2$ term in the gamma-electron case is in agreement with earlier gamma-gamma measurements by Steffen. The electron-gamma ${\overline{A}}_2$ term gives evidence for admixtures due to electric monopole internal conversion as predicted by Church and Weneser.