Freiburg 2024 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 9: Accelerator Mass Spectrometry IV
MS 9.7: Vortrag
Freitag, 15. März 2024, 12:45–13:00, HS 3042
Chasing Stardust: Unveiling Radionuclide Signatures in Antarctic Ice — •Annabel Rolofs1, Dominik Koll1,2, Florian Adolphi3, Maria Hörhold3, Johannes Lachner1, Stefan Pavetich2, Georg Rugel1, Steve Tims2, Sebastian Zwickel1, and Anton Wallner1 — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany — 2Australian National University (ANU), Canberra, Australia — 3Alfred-Wegener-Institut, Bremerhaven, Germany
Radionuclides provide clues about the solar system’s history and can elucidate the role of supernovae in its evolution. The production of 60Fe in massive stars and its ejection in supernovae make this isotope an invaluable indicator to reconstruct cosmic history. Earlier studies showed an 60Fe activity about 2 - 3 Myr ago, as well as an older influx 7 - 8 Myr ago, both attributed to interstellar dust containing traces of supernova-produced 60Fe.
In this project, we analyse continuous-flow analysis (CFA) water from an Antarctic EDML ice core for its radionuclide concentrations to bridge a pivotal time gap in prior 60Fe measurements. Antarctic ice offers a unique geological archive because the isolated location reduces terrestrial contamination to a minimum. The sample material spans a time period from 50,000 to 80,000 years ago. We will present results on the radionuclides 10Be, 26Al and 41Ca that were measured at the DREAMS facility (HZDR), as well as 53Mn and 60Fe which were measured at HIAF (ANU).
Keywords: Nuclear Astrophysics; Accelerator Mass Spectrometry; Interstellar; Antarctica; Ice Core