Abstract

The internal Compton effect, a nuclear transition in which there is a simultaneous ejection of a bound electron and emission of a gamma ray, has been unambigously demonstrated. The experiment concerned the 662 keV transition in Ba 137m and was carried out with a gamma scintillation spectrometer and a beta-ray spectrometer in coincidence. The presence of other effects was carefully considered. The experimental cross section was found to be 1.86 × 10 −5 photons in the energy region 97 keV – 120 keV per conversion electron at 90° between the electron and photon directions. Angular correlation experiments were carried out. Comparison with various theories shows that the theory by Spruch and Goertzel does fit the experimental results excellently both regarding absolute cross section and angular correlation.

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