Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvl..98n1103b&link_type=abstract
Physical Review Letters, vol. 98, Issue 14, id. 141103
Physics
7
Supernovae, Marine Sediments, Turbidity Currents-Processes And Transport, Meteors, Meteorites And Tektites
Scientific paper
An excess of Fe60 in 2.4 3.2×106 year old ferromanganese crust (237KD) from the deep Pacific Ocean has been considered as evidence for the delivery of debris from a nearby supernova explosion to Earth. Extremely high He3/He4 (up to 6.12×10-3) and He3 concentrations (up to 8×109atoms/g) measured in 237KD cannot be supernova-derived. The helium is produced by galactic cosmic rays (GCR) and delivered in micrometeorites that have survived atmospheric entry to be trapped by the crust. Fe60 is produced by GCR reactions on Ni in extraterrestrial material. The maximum He3/Fe60 of 237KD (80 850) is comparable to the GCR He3/Fe60 production ratio (400 500) predicted for Ni-bearing minerals in iron meteorites. The excess Fe60 can be plausibly explained by the presence of micrometeorites trapped by the crust, rather than injection from a supernova source.
Basu Sarbani
Klemm Veronika
Schnabel Christoph
Stuart Finlay M.
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