Mainz 2026 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Poster
MS 5.5: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG
Recent progress in the search of live 182Hf in geological archives — •Sebastian Fichter1, Laurenz Widermann1,2, Alexander Lorenz1, Dominik Koll1, Martin Martschini2, Silke Merchel2, Robin Golser2, and Anton Wallner1 — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Accelerator Mass Spectrometry and Isotope Research, Dresden, Germany — 2University of Vienna, Faculty of Physics, Isotope Physics, Vienna, Austria
The detection and quantification of the astrophysically relevant radionuclide 182Hf (t1/2 = 8.9 × 106 yr) in diverse geological archives would greatly enhance our understanding of potential r-process production sites, particularly when its temporal abundance is compared with other nucleosynthesis radionuclides such as 60Fe and 244Pu. In this study, we report recent progress in developing an optimized chemical protocol for extracting 182Hf from a variety of sample matrices, including deep-sea ferromanganese crusts and nodules. Our primary goal is to achieve high chemical yields while maximizing the separation from interfering elements. A key focus is the suppression of the stable isobar 182W, which remains one of the main factors limiting the direct detection of live 182Hf via Accelerator Mass Spectrometry. In the future, also the newly established Helmholtz Accelerator Mass Spectrometer Tracing Environmental Radionuclides (HAMSTER) at HZDR will participate in this endeavour using its ion cooler setup Ion Linear Trap for Isobar Suppression (ILTIS).
Keywords: AMS; Hafnium-182; Nuclear Astrophysics; Chemical Sample Preparation