Abstract
An iron-free intermediate-imageβ-ray spectrometer was used to investigate theβ-decay of208T1 in coincidence with the 2.615 MeVγ-ray of208Pb. Fourβ-groups were found, three of which were previously known. The fourth group has an endpoint energy of 0.64±0.03 MeV and an intensity of (4.5±1.5)%.
It is supposed that this transition is still complex and feeds a group of levels around the known 4.3 MeV level of208Pb. Noβ-ray of maximum energy 1.032 MeV to the 3.961 MeV level could be found.
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Herrn Prof. Dr. F.Kirchner zum 70. Geburtstag gewidmet.
Herrn W.Bretfeld danken wir für die Ausarbeitung des Rechenprogrammes und für die Durchführung der Rechnungen zur Analyse desβ-Spektrums, Herrn H. T.Buschmann für zahlreiche Diskussionen über das Termschema des208Pb.
Dem Kultusministerium des Landes Nordrhein-Westfalen sind wir für die Bereit-stellung der Mittel zum Bau der Apparatur zu großem Dank verpflichtet.
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Ostertag, H., Lauterjung, K.H. Der β-Zerfall des208Tl. Z. Physik 199, 25–40 (1967). https://doi.org/10.1007/BF01326012
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DOI: https://doi.org/10.1007/BF01326012