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MS: Fachverband Massenspektrometrie
MS 6: Accelerator Mass Spectrometry II
MS 6.4: Vortrag
Donnerstag, 9. März 2023, 15:15–15:30, F128
Improved 60Fe measurements at CologneAMS — Susan Herb, Gereon Hackenberg, Markus Schiffer, Timm Pabst, Elisa Chopan, Alfred Dewald, and •Dennis Mücher — Institut für Kernphysik, Universität zu Köln
Since the first indication of Supernovae (SN) deposited signals in terrestrial reservoirs, the key isotope 60Fe became an appealing isotope for astrophysical applications. Furthermore, 60Fe produced in iron meteorites by galactic cosmic rays via spallation on 62Ni and 64Ni gives pivotal insight into the structure and history of our solar system. AMS is by far the most sensitive method to detect 60Fe, with currently only a single laboratory offering 60Fe AMS measurements, worldwide. This is partly due to the high beam energies required to suppress and separate the highly abundant isobar 60Ni. In this work we present recent improvements of the 10MV AMS system at the University of Cologne which have significantly improved the efficiency and stability of the 60Fe measurements using a gas-filled magnet. The fully digital setup now allows to tune the system and conduct the 60Fe measurements fully automatically, further improving the overall efficiency of the AMS measurements. The currently achieved background level of 60Fe/Fe of about 5·10−15 allows for a routine measurement of iron meterotites. Future ideas to further improve the detection limit and efficiency of the setup will be discussed.