Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..221m&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 26, Sept. 1991, p. 221-242. Research supported by DFG.
Physics
73
Chondrites, Cosmochemistry, Galactic Cosmic Rays, Lunar Surface, Nuclear Chemistry, Nuclides, Protons, Aluminum, Apollo 15 Flight, Chronology, Manganese, Meteoroids, Neon
Scientific paper
A physical model is developed which describes the depth and size dependences of the production of cosmogenic nuclides in meteoroids and in planetary surfaces by interactions with galactic cosmic ray (GCR) protons. It is shown that the depth profiles of cosmogenic nuclides in H- and L-chondrites and in the lunar surface, calculated using this model, agree within experimental errors with measured data. On the basis of the measured depth profiles of Al-26 and Mn-53 in Apollo-15 drill core, the mean GCR proton spectrum at 1 AU during the last 10 MA was determined to be equivalent to a spectrum having a modulation parameter of 480 MeV and integral flux density J(0,pp) = 3.37/sq cm per sec. Using the calculated depth profiles for the production of Ne-21 and the derived mean GCR fluxes in the meteoroid orbits, the exposure ages for ALHA 78084, Keyes, St. Severin, and Knyahinya were calculated and found to be in good agreement with exposure ages derived from common Ne-21 methods.
Cloth P.
Dagge G.
Dragovitsch P.
Filges D.
Michel Rigo
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