Abstract
The spectrum ofK X-rays andγ-rays following the decay of170Tm has been reinvestigated using a high resolution Si(Li) detector. The intensities of theEC-branches from the ground state of170Tm to the ground state as well as to the first excited level in170Er have been measured. The total intensity of theEC-decay is (0.25 ± 0.05)% of all170Tm disintegrations with (0.18 ± 0.05)% leading to the ground state and (0.07±0.02)% leading to the first excited level of170Er. The energy of the de-excitingγ-ray has been determined to (78.7±0.5) keV. Its intensity is (0.28 ± 0.06)% of that of the 84.3 keVγ-ray in170Yb.
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The authors wish to thank Mr. A.Spernol for his encouraging and stimulating discussions, Mr. W.Zehner for the source preparation, Mr. O.Lerch for his sourcecalibration work, and Dr. J.Spaepen, Director of the CBNM for his interest shown in the investigations.
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Hansen, H.H., Hellström, S. TheEC-decay of170Tm. Z. Physik 223, 139–144 (1969). https://doi.org/10.1007/BF01392976
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DOI: https://doi.org/10.1007/BF01392976