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

Date

2018-11-27

Authors

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

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Volume Title

Publisher

American Physical Society

Abstract

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 most of the ratios deduced from nucleosynthesis models and is within the range of the observed average galactic Fe60/Al26 flux ratio of (0.15±0.05).

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Citation

Source

Physical Review Letters

Type

Journal article

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Access Statement

Open Access

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