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The Search for Supernova-Produced Radionuclides in Terrestrial Deep-Sea Archives

Published online by Cambridge University Press:  02 January 2013

J. Feige ,
A. Wallner ,
S. R. Winkler ,
S. Merchel ,
L. K. Fifield ,
G. Korschinek ,
G. Rugel  and
D. Breitschwerdt
J. Feige*
Affiliation:
University of Vienna, Faculty of Physics — Isotope Research, VERA Laboratory, Währinger Straße 17, 1090 Vienna, Austria
A. Wallner
Affiliation:
University of Vienna, Faculty of Physics — Isotope Research, VERA Laboratory, Währinger Straße 17, 1090 Vienna, Austria Department of Nuclear Physics, The Australian National University, Canberra, ACT 0200, Australia ANSTO, Locked Bag 2001, Kirrawee, DC, NSW 2232, Australia
S. R. Winkler
Affiliation:
University of Vienna, Faculty of Physics — Isotope Research, VERA Laboratory, Währinger Straße 17, 1090 Vienna, Austria
S. Merchel
Affiliation:
HZDR, Bautzner Landstraße 400, 01328 Dresden, Germany
L. K. Fifield
Affiliation:
Department of Nuclear Physics, The Australian National University, Canberra, ACT 0200, Australia
G. Korschinek
Affiliation:
Physics Department, TU Munich, James-Franck-Str., 85748 Garching, Germany
G. Rugel
Affiliation:
HZDR, Bautzner Landstraße 400, 01328 Dresden, Germany
D. Breitschwerdt
Affiliation:
Department of Astronomy and Astrophysics, TU Berlin, Germany, Hardenbergstrasse 36, 10623 Berlin, Germany
*
GCorresponding author. Email: jenny.feige@univie.ac.at
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Abstract

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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, abundancesISM: bubblesISM: supernova remnants
Type
Research Front: Astronomy with Radioactivities
Information
Publications of the Astronomical Society of Australia , Volume 29 , Issue 2 , 2012 , pp. 109 - 114
Copyright
Copyright © Astronomical Society of Australia 2012

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