Interstellar 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
 in Antarctica

Koll, Dominik; Korschinek, G.; Faestermann, T.; Gómez-Guzmán, J.M.; Kipfstuhl, Sepp; Merchel, Silke; Welch, Jan M.

doi:10.1103/physrevlett.123.072701

Cited by 68 publications

(67 citation statements)

References 43 publications

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“…TUM Munich: The AMS facility in Munich at the Maier‐Leibnitz‐Laboratory in Garching is also based on a 14 MV tandem accelerator combined with a Gas‐filled Analyzing Magnet System. The isobaric background for the 60 Fe measurements was reduced in the same way as described above for the ANU Canberra setup (Knie et al 2000; Koll et al, 2019a,2019b).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, 60 Fe (and in some cases 53 Mn) have been analyzed in deep sea materials (crusts, nodules, sediments), Antarctic snow, and the lunar regolith as a tracer for nearby supernova explosions (e.g., Knie et al 1999a; Knie et al 2004; Fitoussi et al 2008; Wallner et al 2016; Fimiani et al 2016; Ludwig et al 2016; Koll et al, 2019a,2019b; Wallner et al 2019). Considering meteorites, there are only very few studies that include 60 Fe.…”

Section: Introductionmentioning

confidence: 99%

“…The Gebel Kamil data were used together with data from the aforementioned AMS studies to constrain the activity ratio of 60 Fe to 53 Mn of (2.68 ± 0.35)×10 −3 (dpm kg −1 (Ni)/dpm kg −1 (Fe)). This ratio allowed to disentangle the cosmogenically produced 60 Fe from interstellar 60 Fe in lunar and terrestrial material (Fimiani et al 2016; Koll et al, 2019a,2019b). To summarize, for the last 12 years, only one meteorite study was published that analyzed both heavy radionuclides.…”

Section: Introductionmentioning

confidence: 99%

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

Leya

David

Froehlich

et al. 2020

Meteorit & Planetary Scien

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We measured specific activities of the long-lived cosmogenic radionuclides 60 Fe in 28 iron meteorites and 53 Mn 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 53 Mn. This work doubles the number of existing individual 60 Fe data and quadruples the number of iron meteorites studied for 60 Fe. We also significantly extended the entire 53 Mn database for iron meteorites. The 53 Mn 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 60 Fe and 53 Mn 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 60 Fe activity concentrations are about a factor of two higher; for 53 Mn, they are~30% lower, compared to the earlier model, which gives now a better agreement with the experimental data.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Leya

David

Froehlich

et al. 2020

Meteorit & Planetary Scien

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“…Five hundred kilograms of snow from the Kohnen Station (75°S, 0°E at an elevation of 2892 m) with a measured recent accumulation rate of 80 mm / yr water equivalent were collected and chemically processed [12]. The AMS analysis yielded in total 10 atoms of 60 Fe which correspond to an 60 Fe deposition rate of 1.2 +0.6 −0.5 at / cm 2 / yr considering the sampled mass and accumulation rate [13].…”

Section: Antarctic Snowmentioning

confidence: 99%

“…It is reasonable to assume that these structures contain fragments of supernova synthesized material, possibly including 60 Fe. The penetration of our Solar System into these clouds could lead to an influx of 60 Fe [13].…”

Section: Astrophysical Scenariosmentioning

confidence: 99%

Origin of Recent Interstellar ⁶⁰Fe on Earth

2020

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Over the last 20 years, evidence for a 2 Myr old supernova 60Fe influx onto Earth was provided by several authors. For the first time, independent investigations of samples from two different geological archives yielded conclusive data for a further, much younger 60Fe influx onto Earth. The origin of this influx is currently unclear because of the limited data available, the lack of consistent astrophysical models and a gap in the data between 50 kyr and 1 Myr. Possible astrophysical scenarios will be discussed with respect to the different influx patterns from different sources and a measurement to close the gap will be proposed.

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