The Search for Supernova-Produced Radionuclides in Terrestrial Deep-Sea Archives
J. Feige A G , A. Wallner A B C , S. R. Winkler A , S. Merchel D , L. K. Fifield B , G. Korschinek E , G. Rugel D and D. Breitschwerdt FA University of Vienna, Faculty of Physics — Isotope Research, VERA Laboratory, Währinger Straße 17, 1090 Vienna, Austria
B Department of Nuclear Physics, The Australian National University, Canberra, ACT 0200, Australia
C ANSTO, Locked Bag 2001, Kirrawee, DC, NSW 2232, Australia
D HZDR, Bautzner Landstraße 400, 01328 Dresden, Germany
E Physics Department, TU Munich, James-Franck-Str., 85748 Garching, Germany
F Department of Astronomy and Astrophysics, TU Berlin, Germany, Hardenbergstrasse 36, 10623 Berlin, Germany
G Corresponding author. Email: jenny.feige@univie.ac.at
Publications of the Astronomical Society of Australia 29(2) 109-114 https://doi.org/10.1071/AS11070
Submitted: 1 December 2011 Accepted: 16 February 2012 Published: 21 March 2012
Journal Compilation © Astronomical Society of Australia 2012
Abstract
An enhanced concentration of 60Fe was found in a deep ocean crust in 2004 in a layer corresponding to an age of ~2 Myr. The confirmation of this signal in terrestrial archives as supernova-induced and the detection of other supernova-produced radionuclides is of great interest. We have identified two suitable marine sediment cores from the South Australian Basin and estimated the intensity of a possible signal of the supernova-produced radionuclides 26Al, 53Mn, 60Fe, and the pure r-process element 244Pu in these cores. The finding of these radionuclides in a sediment core might allow us to improve the time resolution of the signal and thus to link the signal to a supernova event in the solar vicinity ~2 Myr ago. Furthermore, it gives us an insight into nucleosynthesis scenarios in massive stars, condensation into dust grains and transport mechanisms from the supernova shell into the solar system.
Keywords: Nuclear reactions, nucleosynthesis, abundances — ISM: bubbles — ISM: supernova remnants
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