Deep-Sea and Lunar Radioisotopes from Nearby Astrophysical Explosions

Author:

Fields Brian D.123,Wallner Anton456

Affiliation:

1. Department of Astronomy, University of Illinois, Urbana, Illinois, USA;

2. Department of Physics, University of Illinois, Urbana, Illinois, USA

3. Illinois Center for Advanced Studies of the Universe, University of Illinois, Urbana, Illinois, USA

4. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany;

5. Research School of Physics, Australian National University, Canberra, Australia

6. Institute of Nuclear and Particle Physics, Technische Universität Dresden, Dresden, Germany

Abstract

Live (not decayed) radioisotopes on the Earth and Moon are messengers from recent nearby astrophysical explosions. Measurements of 60Fe in deep-sea samples, Antarctic snow, and lunar regolith reveal two pulses about 3 Myr and 7 Myr ago. Detection of 244Pu in a deep-sea crust indicates a recent r-process event. We review the ultrasensitive accelerator mass spectrometry techniques that enable these findings. We then explore the implications for astrophysics, including supernova nucleosynthesis, particularly the r-process, as well as supernova dust production and the formation of the Local Bubble that envelops the Solar System. The implications go beyond nuclear physics and astrophysics to include studies of heliophysics, astrobiology, geology, and evolutionary biology.

Publisher

Annual Reviews

Subject

Nuclear and High Energy Physics

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