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MS: Fachverband Massenspektrometrie
MS 12: Accelerator Mass Spectrometry and Applications III
MS 12.4: Vortrag
Donnerstag, 12. März 2020, 14:45–15:00, f128
Supernova-produced 53Mn on Earth — •Gunther Korschinek1, Thomas Faestermann1, Mikhail Poutivtsev2, Andres Arazi3, Klaus Knie4, Georg Rugel5, and Anton Wallner5 — 1Physik-Department, Technische Universität München, 857 Garching, Germany — 2DAW SE, 64372 Ober-Ramstadt, Germany — 3Laboratorio TANDAR, Comision Nacional de Atomica, Av. Gral. Paz 1499, B1650KNA San Martin, Argentina — 4GSI Helmholtz-Zentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — 5Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
For the age range from 1.5 to 4 Myr ago we found in deep ocean ferromanganese crusts an excess concentration in terms of 53Mn/Mn of about 4·10−14 over that expected for cosmogenic production. We conclude that this 53Mn is of supernova origin because it is detected in the same time window, about 2.5 Myr ago, where 60Fe has been found earlier. This overabundance confirms unambiguously the supernova (SN) origin of that 60Fe. For the first time supernova-formed 53Mn has been detected and it is the second positively verified radioisotope from the same supernovae. The ratio 53Mn/60Fe of about 12 is consistent with that expected for a SN with a 11 - 25 M⊙ progenitor mass and solar metallicity. A fit over the whole range until 10 Myr shows also a second increase of 53Mn/Mn in the range around 6 Myr matching recent 60Fe detection in sediments at ANU.