Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Nukleare Astrophysik

HK 40.5: Vortrag

Donnerstag, 20. März 2014, 15:30–15:45, HZ 5

Search for Supernova-produced 60Fe in the Earth’s Fossil Record — •Shawn Bishop1, Peter Ludwig1, Ramon Egli2, Valentyna Chernenko1, Thomas Faestermann1, Nicolai Famulok1, Leticia Fimiani1, Thomas Frederichs3, Jose Gomez1, Karin Hain1, Marianne Hazlik4, Gunther Korschinek1, Silke Merchel5, and Georg Rugel51TU München, Physik Department — 2ZAMG, Wien — 3Universität Bremen, Geowissenschaften — 4TU München, Fakultät für Chemie — 5HZDR, Dresden

Approximately 1.8 to 2.8 Myr before the present our planet was subjected to the debris of a supernova explosion. The terrestrial proxy for this event was the discovery of live atoms of 60Fe in a deep-sea ferromanganese crust [Knie et al., Phys. Rev. Lett. (2004)]. The signature for this supernova event should also reside in magnetite (Fe3O4) magnetofossils produced by magnetotactic bacteria extant at the time of the Earth-supernova interaction; these bacteria were and are ubiquitous in all ocean sediments. We have conducted accelerator mass spectrometry (AMS) measurements, searching for live 60Fe in the magnetofossil component of a Pacific Ocean sediment core (ODP Core 848); additional AMS measurements are now ongoing with a second sediment core (ODP Core 851) in which we expect to find a higher 60Fe signal. This talk will present the current preliminary status of our 60Fe search results for both sediment cores.

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