Abstract
The gamma-rays of Tm-169 excited through electron capture in Yb-169 have been studied by use of a bent-crystal gamma-ray spectrometer. A source of high specific activity was produced from highly enriched Yb-168 by neutron capture. In addition to gamma rays previously reported we observe gamma rays with energies of 117.25 keV, 156.66 keV and 336.5 keV. The 117.25 keV gamma ray probably is due to the depopulation of a 9 2 + (K = 7 2 ) state at 433.44 keV. The relative intensities of most of the gamma rays were measured to ±5%. Electron capture branching ratios to the various levels were derived. Branching ratios for transitions between different rotational bands were studied in detail. Most M1 and E2 interband branching ratios are in agreement with predictions based on recent formulas by Bohr and Mottelson while all E1 branching ratios differ from these predictions by an order of magnitude.
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