Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 75: Anwendungen kernphysikalischer Methoden
HK 75.4: Vortrag
Donnerstag, 7. März 2013, 18:00–18:15, HSZ-204
Hints of supernova debris deposition on the lunar surface: 60Fe and 53Mn measurements by means of accelerator mass spectrometry — •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, Technische Universität München, Garching, Germany — 2Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, USA — 3Forschungszentrum Dresden Rossendorf, Dresden, Germany
The enhanced concentration of 60Fe in a deep ocean ferro-manganese crust about (2.1±0.4) Myr old (Fitoussi et al., PRL 101, 121101 (2008)), suggests that one or more supernova (SN) explosions occurred in the vicinity of the Solar System. That observation was only possible with the ultra sensitive Accelerator Mass Spectrometry (AMS) technique at the Maier-Leibnitz-Laboratorium in Munich, where we are able to measure concentrations of 60Fe/Fe down to a level of 10−16. 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. 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.