Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Poster - Nukleare Astrophysik
HK 57.11: Poster
Wednesday, March 6, 2013, 16:45–19:00, HSZ 4.OG
Production rate of 41Ca in Interplanetary Dust Particles and the possibility to measure by means of Accelerator Mass Spectrometry (AMS) — •Jose Manuel Gómez-Guzmán, Thomas Faestermann, Leticia Fimiani, Karin Hain, Stephan Jahn, Gunther Korschinek, and Peter Ludwig — Physik Department E12/E15, TU München. D-85748 Garching, Germany.
Interplanetary Dust Particles (IDP) are small grains in orbit around the Sun. The most important source of IDP is the Asteroid Belt located at approximately 3 AU between Mars and Jupiter. During their flight to the Earth they are irradiated by SCR and GCR (solar and galactic cosmic rays) and some radionuclides are formed, including 41Ca and 53Mn.
41Ca (T1/2=1.03×105 y) can be used as a unique tracer to determine the accretion rate of IDP on Earth because there are no significant terrestrial sources for this radionuclide. In this work, a model describing the irradiation history of these IDP and the expected 41Ca production rate due to this irradiation are shown. Once known, the 41Ca accretion rate on Earth can be calculated. This is the first time that 41Ca will be used as tracer of extraterrestrial matter, due to the very low expected 41Ca/40Ca ratios, in the order of 10−15. The AMS facility of the MLL, with sensitivity down to 10−16 for this radionuclide, is presently the only one with the capacity to measure these low ratios.