Abstract

High-precision K x- gamma coincidence measurements have been performed in the electron-capture decay of 158Tb in order to measure the K-capture probability to the high-lying levels in 158Gd. Results show that the Q-value of this decay does not allow an ultra-low-energy capture decay to the 1187 keV level as predicted previously. In addition, the K x- gamma coincidence measurements do not show any such event within the statistical errors.

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