Köln 2025 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Application to Astrophysics
MS 4.5: Vortrag
Dienstag, 11. März 2025, 17:00–17:15, HS 2 Chemie
Challenges in the extraction of 182Hf from geological archives — •Sebastian Fichter1, Dominik Koll1, Sebastian Zwickel1, Martin Martschini2, Silke Merchel2, Laurenz Widermann2, Robin Golser2, and Anton Wallner1 — 1HZDR, Dresden, Germany — 2University of Vienna, Faculty of Physics, Austria
The identification and measurement of the astrophysically relevant radionuclide 182Hf (t1/2 = 8.9 * 106 yr) in different geological archives would significantly advance our understanding of potential r-process sites, especially when its abundance is compared to other nucleosynthesis radionuclides such as 60Fe and 244Pu over time. In this work, we present our recent efforts to develop a suitable chemical protocol to extract 182Hf from various sample matrices including deep-sea ferromanganese crusts. The main objective of this work is to maintain a high chemical yield while separating other elements as much as possible. Special attention is paid to the suppression of the stable isobar 182W, which is yet one of the limiting factors preventing the actual measurement of live 182Hf using Accelerator Mass Spectrometry (AMS). This work is partly funded by ChETEC-INFRA.
Keywords: AMS; Hafnium-182; Nuclear Astrophysics