DPG Phi
Verhandlungen
Verhandlungen
DPG

Freiburg 2024 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MS: Fachverband Massenspektrometrie

MS 9: Accelerator Mass Spectrometry IV

MS 9.1: Hauptvortrag

Freitag, 15. März 2024, 11:00–11:30, HS 3042

Influx of interstellar 60Fe and 244Pu onto Earth within the last 10 million years recorded in a ferromanganese crust — •Dominik Koll1,2,3, Anton Wallner2,3, Michael Hotchkis4, Sebastian Fichter2, L. Keith Fifield1, Michaela Froehlich1, Michi Hartnett1, Johannes Lachner2, Stefan Pavetich1, Georg Rugel2, Zuzana Slavkovska1, and Steve Tims11The Australian National University, Canberra, Australia — 2Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 3TU Dresden, Dresden, Germany — 4Australian Nuclear Science and Technology Organisation, Sydney, Australia

Within the last 25 years, copious evidence was presented for supernova-produced 60Fe influxes onto Earth using accelerator mass spectrometry (AMS); pointing to a near-Earth supernova activity within the last few million years. The rare interstellar r-process radionuclide 244Pu, however, was only recently discovered. The combination of both, supernova-produced 60Fe and r-process 244Pu, allows to shed light onto the nucleosynthesis site of heavy elements in the universe.

A well-characterized and 10Be-dated ferromanganese crust from the Pacific Ocean was used to search for 60Fe and 244Pu abundances with unprecedented time-resolution and sensitivity. The acquired 60Fe profile shows two pronounced peaks of 60Fe influxes with updated timing. A r-process 244Pu influx was discovered with a time-resolution of 1 Myr within the last 10 Myr due to the extraordinarily high total efficiency of Pu AMS of 1% achieved in this project.

Keywords: AMS; 60Fe; 244Pu; Ferromanganese crust; Supernova

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2024 > Freiburg