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MS: Fachverband Massenspektrometrie

MS 5: Accelerator Mass Spectrometry 1

MS 5.4: Vortrag

Mittwoch, 7. März 2018, 15:00–15:15, R 1.020

Search for Recent ⁶⁰Fe Deposition in Antarctic Snow via AMS — •Dominik Koll¹, Christoph Busser¹, Thomas Faestermann¹, Leticia Fimiani¹, J. M. Gomez-Guzman¹, Angelina Kinast¹, Gunther Korschinek¹, David Krieg¹, Manuel Lebert¹, Silke Merchel², Johannes Sterba³, Jan Welch³, and Sepp Kipfstuhl⁴ — ¹Physik Department, Technische Universität München, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Germany — ³Atominstitut, Technische Universität Wien, Austria — ⁴Alfred-Wegener-Institut, Germany

⁶⁰Fe with a half-life of 2.6 Myr [1] is produced in stellar environments and ejected into space mainly by core-collapse supernovae. Due to its long half-life, traces of ⁶⁰Fe were deposited and incorporated on Earth and on the Moon and have been detected there [2,3,4,5].

Here, a new possible reservoir will be presented: Antarctic snow. This time, in contrast to former investigations, any signal detected would be recent material which might origin from the local interstellar cloud. 500 kg of Antarctic snow were chemically processed and are going to be analyzed by AMS in Munich at the 14 MV tandem. First results for ⁶⁰Fe measurements will be presented as well as chemical extraction methods applied.

[1] Rugel et. al. ; Phys. Rev. Lett. 103, 072502 (2009)

[2] Knie et. al. ; Phys. Rev. Lett. 93, 171103 (2004)

[3] Ludwig et. al. ; PNAS 113 (33), 9232-9237 (2016)

[4] Wallner et. al. ; Nature 532, 69-72 (2016)

[5] Fimiani et. al. ; Phys. Rev. Lett. 116, 151104 (2016)