Berlin 2014 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Poster
MS 6.1: Poster
Mittwoch, 19. März 2014, 14:00–14:00, DO24 Foyer
Search for Supernova debris on the Moon — •Leticia Fimiani1, Thomas Faestermann1, Jose Manuel Gomez Guzman1, Karin Hain1, Gregory Herzog2, Gunther Korschinek1, Bret Ligon2, Peter Ludwig1, Jisun Park2, and Georg Rugel3 — 1Physics Department, Technische Universität München, Garching, Germany — 2Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, United States — 3Forschungszentrum Dresden Rossendorf, Dresden, Germany
The enhanced deposition of 60Fe in a deep ocean ferro-manganese crust about (2.1±0.4) Myr ago (Knie et al., PRL 93, 171103 (2004), Fitoussi et al., PRL 101, 121101 (2008)) indicate that one or more supernova (SN) explosions occurred in the vicinity of the Solar System. That observation was only possible with the ultrasensitive Accelerator Mass Spectrometry (AMS) technique at the Maier-Leibnitz-Laboratory, which is able to measure concentrations of 60Fe/Fe down to a level of 10−16 and even below. Due to its lack of atmosphere and its negligible sedimentation rate, the Lunar surface is an excellent quantitative reservoir for SN debris. We searched for live 60Fe (T1/2=2.62×106 yr) and 53Mn (T1/2=3.7×106 yr) in different samples from 3 Apollo missions. 53Mn is, similar as 26Al and 60Fe, a tool to trace nucleosynthesis activities. It is formed primarily during the explosive silicon-burning of the inner shells of SNe via 53Fe which β-decays to 53Mn. Samples where we found an enhanced 60Fe concentration showed also an enhancement of 53Mn. This could be the first detection of live 53Mn originating from recent nucleosynthesis.