Search for supernova-produced 60Fe in a marine sediment |
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| Authors: | Fitoussi C Raisbeck G M Knie K Korschinek G Faestermann T Goriely S Lunney D Poutivtsev M Rugel G Waelbroeck C Wallner A |
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| Institution: | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM) IN2P3/CNRS, Université Paris Sud, Batiment 108, Orsay, France. |
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| Abstract: | 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, Phys. Rev. Lett. 93, 171103 (2004)10.1103/PhysRevLett.93.171103]. 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. |
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