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

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‐...

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Published inMeteoritics & planetary science Vol. 55; no. 4; pp. 818 - 831
Main Authors Leya, Ingo, David, Jean‐Christophe, Faestermann, Thomas, Froehlich, Michaela, Kivel, Niko, Koll, Dominik, Korschinek, Gunther, McIntyre, Sarah, Merchel, Silke, Pavetich, Stefan, Rugel, Georg, Schumann, Dorothea, Smith, Thomas, Wallner, Anton
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Subscription Services, Inc 01.04.2020
Subjects
Cross-sections
Heavy ions
Iron
Iron isotopes
Iron meteorites
Mass spectrometry
Mathematical models
Meteorites
Meteors & meteorites
Nuclear models
Radioisotopes
Shielding
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Summary: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.
ISSN:1086-9379
1945-5100
DOI:10.1111/maps.13466