Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Structure and Dynamics of Nuclei VI
HK 22.4: Talk
Wednesday, March 18, 2026, 15:00–15:15, AM 00.021
Electron-capture decay of Tc-98 — •Dominik Elchine1, Martin Müller2, Markus Schiffer3, and Erik Strub1 — 1Division of Nuclear Chemistry, University of Cologne, Zülpicher Str. 45, 50674 Cologne, Germany — 2Institute for Nuclear Physics, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany — 3Faculty of Arts and Humanities, Department of Prehistoric Archaeology, Laboratory of Isotope Archaeology
From simple symmetry and energy considerations it can be concluded that 98Tc might undergo electron capture decay (EC). In this work we provide evidence for an EC decay of 98Tc measuring 2.67 g K[TcO4] that contains approximately 1 GBq of 99Tc. By use of a lead shielding for the sample, it was possible to identify the coincident 4+→2+ and 2+→0+ γ transitions in the daughter nuclide 98Mo at the clover setup of the Institute for Nuclear Physics at the University of Cologne. For the first time, the EC/β− branching ratio of 0.29(3)% was determined directly. With a log ft of 14.21(7) this decay does almost tie with the log ft of the 36Cl EC decay [14.23(1)] for the same highest second forbidden nonunique transition.
Keywords: new decay path; Technetium; electron capture; branching ratio; coincident gamma measurement