Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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AMS within Eurogenesis: Nanodiamonds and SN-signatures
Wallner, A.; Feige, J.; Fifield, K.; Korschinek, G.; Melber, K.; Merchel, S.; Ott, U.; Paul, M.; Rugel, G.; Steier, P.; Tims, S.; Vockenhuber, C.
CoDustMas is a Collaborative Research Project (CRP) of Eurogenesis, one of the EUROCORES programmes of the European Science Foundation. This international network aims at understanding the crucial role that supernovae (SNe) play in the formation of cosmic dust. Specifically, this CRP will study the synthesis of dust grains in core-collapse supernovae; isotopic signatures in dust grains; and mixing, evolution and transport of dust in supernova remnants.
Applying accelerator mass spectrometry (AMS) two aspects are tackled. First, the measurement of trace element isotope ratios in presolar nanodiamonds isolated from primitive meteorites, e.g. the ratios of Pt isotopes to extract r-process nucleosynthesis signatures. Recent results demonstrate the applicability of AMS for determining stable Pt isotope signatures in diamonds extracted from Allende. These AMS data may indicate a small 198Pt anomaly; its significance and new approaches will be discussed.
The second aspect relates to the search for live SN-produced radionuclides in terrestrial deep-sea archives. In particular, the focus is on isotopes with half-lives of the order of million years. We continue this search by investigating, with high time resolution, two deep-sea sediment cores from the Indian Ocean for a possible signal of the SN-candidates 26Al, 53Mn, 60Fe, and potentially 244Pu.
Keywords: accelerator mass sepctrometry; AMS; Pt; supernova; radionuclide
XII International Symposium on Nuclei in the Cosmos, 05.-10.08.2012, Cairns, Australia