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Limits on Supernova-Associated Fe 60/Al 26 Nucleosynthesis Ratios from Accelerator Mass Spectrometry Measurements of Deep-Sea Sediments

Feige, J.; Wallner, Anton; Altmeyer, Randolf; Fifield, L Keith; Golser, Robin; Merchel, S.; Rugel, G.; Steier, Peter; Tims, Stephen; Winkler, S. R.


We searched for the presence of Al26 in deep-sea sediments as a signature of supernova influx. Our data show an exponential dependence of Al26 with the sample age that is fully compatible with radioactive decay of terrigenic Al26. The same set of samples demonstrated a clear supernova Fe60 signal between 1.7 and 3.2 Myr ago. Combining our Al26 data with the recently reported Fe60 data results in a lower limit of 0.18-0.08+0.15 for the local interstellar Fe60/Al26 isotope ratio. It compares to...[Show more]

CollectionsANU Research Publications
Date published: 2018-11-27
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.121.221103
Access Rights: Open Access


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