SAMOP 2023 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Accelerator Mass Spectrometry II
MS 6.3: Vortrag
Donnerstag, 9. März 2023, 15:00–15:15, F128
Measurement of Interstellar Radionuclides as Fingerprints of Recent r-Process Events — •Sebastian Zwickel1,2, Sebastian Fichter1, Dominik Koll1, Johannes Lachner1, Georg Rugel1, Konstanze Stuebner1, Carlos Vivo Vilches1, Stephan Winkler1, and Anton Wallner1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Technical University Dresden, Dresden, Germany
Interstellar radionuclides deposited in our solar system can give information about recent nucleosynthesis events in the solar neighbourhood. The detection of 60Fe with Accelerator Mass Spectrometry (AMS) in various geological and lunar samples yields evidence for two nearby supernovae (SNe) in the last 10 My. Measuring pure r-process 244Pu in the same samples can relate SN nucleosynthesis with r-process signatures; either as a concomitant production or deposition. Its first detection in a deep sea manganese crust demonstrates the recent deposition of interstellar r-process nuclides in terrestrial archives, but is suffering from poor time resolution due to the rarity of 244Pu.
This talk discusses the motivation and chemical sample preparation towards the search for 244Pu as well as other radionuclides in lunar soil. The absence of geological activity allows for a longer search into the past than is possible with terrestrial material.