Hannover 2016 – wissenschaftliches Programm
MS 9.5: Vortrag
Donnerstag, 3. März 2016, 15:45–16:00, f128
Accretion rate of IDPs onto the Earth by means of 53Mn and 41Ca AMS measurement in Antarctic snow — •Jose Manuel Gomez Guzman1, Shawn Bishop1, Thomas Faestermann1, Jenny Feige2, Leticia Fimiani1, Karin Hain1, Sepp Kipfstuhl3, Gunther Korschinek1, Peter Ludwig1, Silke Merchel4, Dario Rodrigues5, Johannes Sterba6, Jan Welch6, and Rolf Weller3 — 1Technische Universität München, Fakultät für Physik, Garching (Germany) — 2Zentrum für Astronomie und Astrophysik TU Berlin, Berlin (Germany) — 3Helmholtz-Zentrum Alfred-Wegener-Institut. Bremerhaven (Germany) — 4Helmholtz-Zentrum Dresden-Rossendorf (Germany) — 5Laboratorio TANDAR, Comisión Nacional de Energía Atómica (Argentina) — 6Atominstitut der Technische Universität Wien (Austria)
Interplanetary Dust Particles (IDPs) are small grains, a few hundred micrometers in size and mainly originated in the Asteroid Belt. During their flight to the Earth they are irradiated by GCR and SCR and 41Ca (T1/2=1.03×105 yr) and 53Mn (T1/2=3.68×106 yr) are formed. Since there are no significant terrestrial sources for those radionuclides they can be used as a key tracer to determine the accretion rate of IDPs onto the Earth. For this project, 550 kg of snow have been collected at the Antarctic German station Kohnen to be processed to extract 41Ca and 53Mn. Also the filter used will be processed to check the existence of IDPs surviving evaporation during their entry in the atmosphere. The AMS measurements will be made at the MLL in Garching, a facility with sensitivity down to 10−16 for 41Ca and 10−14 for 53Mn.