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Anton Wallner (Australia): Supernova explosions near Earth

Donnerstag, 29. Juni 2017, 16:30

Ort:  Victor-Franz-Hess-Hörsaal, Wahringer Str. 17, 1. Stock Kavalierstrakt

The Interstellar Medium (ISM) is continuously fed with new nucleosynthetic
products. The solar system moves through the ISM and collects dust particles. A
pioneering work at TU Munich, using accelerator mass spectrometry (AMS), found an extraterrestrial radioactive 60Fe deposition in deep-sea crusts, possibly of supernova origin.
Within an international collaboration we demonstrated recently that indeed multiple supernova explosions happened in our galactic neighbourhood within the last 10 million years and left their fingerprint on Earth.
Still unknown is the astrophysical site where the heaviest elements are made in
nature. Low concentrations measured for interstellar 244Pu indicate a rarity of heavy element nucleosynthesis, incompatible with standard supernovae as the predominant actinide-producing sites.
I will present new results for both 60Fe and 244Pu, measured with unprecedented AMS sensitivity. These data provide new insights into recent nearby supernova explosions and heavy element nucleosynthesis.

Fakultät für Physik
Universität Wien

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Do 14-16 Uhr

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