Cosmic ray exposure ages of chondrites, pre-irradiation and constancy of cosmic ray flux in the past

Details Cosmic ray exposure ages of chondrites, pre-irradiation and constancy of cosmic ray flux in the past Cosmic ray exposure ages of chondrites, pre-irradiation and constancy of cosmic ray flux in the past

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..50..156n&link_type=abstract

Earth and Planetary Science Letters, vol. 50, no. 1, Oct. 1980, p. 156-170.

Astronomy and Astrophysics

Astronomy

43

Chondrites, Cosmic Rays, Meteoritic Composition, Neon Isotopes, Nuclides, Particle Production, Abundance, Chemical Composition, Particle Interactions, Radioactive Isotopes, Meteorites, Chondrites, Cosmic Rays, Exposure Ages, Production Rate, Flux, Data, Catalogs, Isotopes, Ages, Calibrations, Isotopic Ratios, Sodium, Neon, Helium, Argon, Krypton, Phosphorus, Concentrations, Aluminum, Manganese, Saturation, Models

Scientific paper

Calibration of the production rate of the Ne-21 nuclide was accomplished by 4 methods based on (Al-26)-age, (Mn-53)-age, Kr-81/Kr-83, and Na-22/Ne-22. These production rates are normalized to a shielding parameter ratio Ne-22/Ne-21 = 1.11 and to the chemical composition of L chondrites; a value of P(21)(1.11) = 0.31 is suggested, and a production rate equation derived in terms of the 'F' parameters for L, LL, and H chondrites. The Al-26 half-life measurements are considered to evaluate the effects resulting from preirradiation of meteorites and to examine the data on the constancy of the cosmic ray flux in the light of current astronomical observations.

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