53Mn and 60Fe in iron meteorites—New data, model calculations

Ingo Leya*, Jean Christophe David, Thomas Faestermann, Michaela Froehlich, Niko Kivel, Dominik Koll, Gunther Korschinek, Sarah McIntyre, Silke Merchel, Stefan Pavetich, Georg Rugel, Dorothea Schumann, Thomas Smith, Anton Wallner

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    We measured specific activities of the long-lived cosmogenic radionuclides 60Fe in 28 iron meteorites and 53Mn in 41 iron meteorites. Accelerator mass spectrometry was applied at the 14 MV Heavy Ion Accelerator Facility at ANU Canberra for all samples except for two which were measured at the Maier-Leibnitz Laboratory, Munich. For the large iron meteorite Twannberg (IIG), we measured six samples for 53Mn. This work doubles the number of existing individual 60Fe data and quadruples the number of iron meteorites studied for 60Fe. We also significantly extended the entire 53Mn database for iron meteorites. The 53Mn data for the iron meteorite Twannberg vary by more than a factor of 30, indicating a significant shielding dependency. In addition, we performed new model calculations for the production of 60Fe and 53Mn in iron meteorites. While the new model is based on the same particle spectra as the earlier model, we no longer use experimental cross sections but instead use cross sections that were calculated using the latest version of the nuclear model code INCL. The new model predictions differ substantially from results obtained with the previous model. Predictions for the 60Fe activity concentrations are about a factor of 2 higher, for 53Mn, they are ~30% lower, compared to the earlier model, which gives now a better agreement with the experimental data.

    Original languageEnglish
    Pages (from-to)818-831
    Number of pages14
    JournalMeteoritics and Planetary Science
    Volume55
    Issue number4
    DOIs
    Publication statusPublished - 1 Apr 2020

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