Hannover 2013 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 10: Accelerator Mass Spectrometry and Applications III
MS 10.7: Vortrag
Donnerstag, 21. März 2013, 15:30–15:45, F 442
Indications of supernova debris deposition on the Moon: Live 60Fe and 53Mn in Lunar samples — •Leticia Fimiani1, Thomas Faestermann1, José Manuel Gómez Guzmán1, Karin Hain1, Gregory Herzog2, Gunther Korschinek1, Bret Ligon2, Peter Ludwig1, Jisun Park2, and Georg Rugel3 — 1Physik Department E12, Technische Universität München, Garching, Germany — 2Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, USA — 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)) indicates that one or more supernova (SN) explosions occurred in the vicinity of the Solar System. Because of its lacking atmosphere and negligible sedimentation rate, the Lunar surface is an excellent quantitative reservoir for SN debris. We searched for live 60Fe and 53Mn in 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 with an 8.51 min half-life. The measurements were performed at the Maier-Leibnitz-Laboratorium in Munich. With the Gas-filled Analyzing Magnet System (GAMS) we are able to measure concentrations of 60Fe/Fe down to a level of 10−16. Samples where we found an enhanced 60Fe concentration showed also an enhancement of 53Mn. If confirmed, this could be the first detection of live 53Mn originating from nucleosynthesis.