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Phys. Rev. Lett. 101, 121101 (2008) [4 pages]

Search for Supernova-Produced 60Fe in a Marine Sediment

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C. Fitoussi1, G. M. Raisbeck1, K. Knie2,5, G. Korschinek2, T. Faestermann2, S. Goriely3, D. Lunney1, M. Poutivtsev2, G. Rugel2, C. Waelbroeck4, and A. Wallner5
1Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM) IN2P3/CNRS, Université Paris Sud, Bâtiment 108, 91405 Orsay, France
2Fakultät für Physik, Technische Universität München, James-Franck-Straße 1, 85747 Garching, Germany
3Institut d’Astronomie et d’Astrophysique, C.P. 226, Université Libre de Bruxelles, Boulevard Du Triomphe, B-1050 Brussels, Belgium
4Laboratoire des Sciences du Climat et de l’Environnement, Domaine du CNRS, 91198 Gif-sur-Yvette, France
5VERA Laboratory, Fakultät für Physik, Universität Wien, Währinger Straße 17, A-1090 Vienna, Austria

Received 10 August 2007; revised 5 February 2008; published 19 September 2008

An 60Fe peak in a deep-sea FeMn crust has been interpreted as due to the signature left by the ejecta of a supernova explosion close to the solar system 2.8±0.4  Myr ago [ Knie et al. Phys. Rev. Lett. 93 171103 (2004)]. In an attempt to confirm this interpretation with better time resolution and obtain a more direct flux estimate, we measured 60Fe concentrations along a dated marine sediment. We find no 60Fe peak at the expected level from 1.7 to 3.2 Myr ago. Possible causes for the discrepancy are discussed.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.121101
DOI:
10.1103/PhysRevLett.101.121101
PACS:
97.60.Bw, 26.30.−k, 91.50.Jc
 
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