The study of 177mLu decay

High-precision measurements of the relative gamma-ray intensities from the decay of 177mLu were performed by means of a gamma-spectrometer. The data were used to determine the internal conversion coefficient (ICC) for the K-forbidden E1-transition with the energy of 55 keV in 177Hf. High value of the hindrance factor for the gamma-radiation leads to anomalies in the ICC which are observed in the experiment. The discrepancy between experimental and theoretical values of ICC cannot be explained by admixtures of different multipolarities with the same parity. Such variance can be eliminated only by assuming the presence of intranuclear conversion.