Abstract
An Fe60 peak in a deep-sea FeMn crust has been interpreted as due to the signature left by the ejecta of a supernova explosion close to the solar system 2.8±0.4Myr ago. In an attempt to confirm this interpretation with better time resolution and obtain a more direct flux estimate, we measured Fe60 concentrations along a dated marine sediment. We find no Fe60 peak at the expected level from 1.7 to 3.2 Myr ago. Possible causes for the discrepancy are discussed.
Original language | English |
---|---|
Article number | 121101 |
Journal | Physical Review Letters |
Volume | 101 |
Issue number | 12 |
DOIs | |
Publication status | Published - 19 Sept 2008 |
Externally published | Yes |