Abstract
Molybdenum fission products from Uranium were rapidly separated using a sublimation technique. Their Technetium daughters could be separated from the Molybdenum sample by a second sublimation. The decay of Tc103, Tc104 and Tc105 was investigated using scintillation counters and coincidence methods.
Tc103 decays by the emission of twoβ-groups at energies of 2·0 Mev and 2·2 Mev followed byγ-lines of 135 kev, 215 kev and 350 kev. According to a proposed decay-scheme Tc103 decays with aQ-value of 2·35±0·10 Mev into Ru103.
Tc105 emits aβ-group of about 3·4 Mev maximum energy followed by a 110 kevγ-transition. TheQ-value of the Tc105 decay was estimated to be 3·4±0·2 Mev. Fromβ−γ- andγ−γ-coincidence spectra of Tc104 fourβ−γ-γ-cascades could be identified, which populate excited states of 0·36 Mev, 0·89 Mev, 2·5 Mev, 3·5 Mev and 4·05 Mev in Ru104. TheQ-value of the Tc104 decay was found to be 5·85±0·10 Mev.
TheQ-values and spin assignements of the groundstates of Tc103 and Tc105 are discussed in a more detailedβ-decay systematic.
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Herrn Professor H.Maier-leibnitz, Herrn Professor H. J.Born und Herrn Professor E. O.Fischer danken wir für die wohlwollende Förderung der Arbeit. Ebenso danken wir Herrn Dr. F.Baumgärtner für seine Hilfe zu Beginn der Arbeit.
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Kienle, P., Wien, K., Zahn, U. et al. Die β-Zerfallsenergie der Technetiumisotope Tc103, Tc104 und Tc105 . Z. Physik 176, 226–236 (1963). https://doi.org/10.1007/BF01390597
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DOI: https://doi.org/10.1007/BF01390597