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Supernova-produced 26Al and 60Fe in deep-sea sediments from the Indian Ocean
Feige, J.; Wallner, A.; Fifield, L. K.; Merchel, S.; Rugel, G.; Steier, P.; Tims, S.; Winkler, S. R.; Golser, R.
The long-lived radionuclides 26Al (t1/2 = 0.72 Myr) and 60Fe (t1/2 = 2.6 Myr) are generated in massive stars and ejected into space by stellar winds and explosions. If a star ends its life in a supernova (SN) explosion close to the solar system, a fraction of these elements might be deposited in terrestrial archives. Recent analysis of a ferromanganese crust [1,2] evidences an 60Fe concentration enhancement ~2-3 Myr ago. This radionuclide does not have terrestrial sources and is suggested to originate from one or more SNe . Depth profiles with ~100 individual samples from deep-sea sediment cores (Indian Ocean) are studied to obtain a detailed data set of 26Al and 60Fe concentrations within the time period of the 60Fe signal in the crust. The targets were measured using accelerator mass spectrometry . In contrast to our 60Fe data, which shows a clear signal without terrestrial background, a possible 26Al signal from a SN event is hidden within a non-negligible terrestrial background production . The major source of 26Al is spallogenic production by cosmic-rays in the Earth’s atmosphere. This first full history of precise 26Al and 60Fe data over a time period of 2 Myr for two sediment cores is compared to theoretical estimations of a SN-produced radionuclide deposition on Earth considering different nucleosynthesis models and SN signal widths.
 Knie et al., Phys. Rev. Lett 93 (2004)
 Fitoussi et al., Phys. Rev. Lett 101 (2008)
 Wallner er al., this conf.
 Feige et al., EPJWC, 63 (2013)
Keywords: accelerator mass spectrometry; supernova; cosmogenic radionuclide
XIII Nuclei in the Cosmos, 07.-11.07.2014, Debrecen, Ungarn