Sum?Coincidence Measurements on 154Eu

Abstract

By examining y-rays from the radioisotope 154Eu with a fast-slow sum-coincidence spectrometer any ('I-transition to a possible 1· 82 MeV level in 154Gd has been shown to have an abundance less than 1 % of that of the ('I-transition to the neighbouring 1· 72 MeV level. The presence of a 1· 60 MeV y-ray from the 1· 72 MeV level is confirmed; the intensity of this y-ray was found to be 6·4 % of that of the 1· 28 MeV y-ray.