Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.468g&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 468
Other
2
Chondrites, Cosmology, Krypton, Mathematical Models, Monte Carlo Method, Xenon, Cosmic Rays, Grain Size, Particle Size Distribution, Radiation Effects, Radioactive Isotopes
Scientific paper
An artificial meteoroid made of gabbro with a diameter of 50 cm was isotropically irradiated as SATURNE by 1.6-GeV protons in order to simulate galactic-cosmic-ray proton interaction with stony meteorites in space. Twenty-five target elements were located at 10 different depths to measure production rates of stable and radioactive isotopes of interest in this field. Model calculations were developed by collaborators (Hannover group), combining a Monte Carlo approach for the determination of depth and size dependence of the primary and secondary particles in the irradiated sphere with experimental and theoretical excitation functions of production for the different studied nuclides. These calculations can be extend to a physical description of cosmic ray interactions with meteorites, taking into account the real condition of irradiation in space. The determination of reliable experimental depth profiles inside the irradiated sphere and the availability of precise thin target cross sections is crucial for improving and validating the model calculations. The presentation focused on a detailed analysis of cosmogenic Kr production. In chondrites, Kr is mainly produced in Rb, Sr, Y, and Zr. New cross sections of production by 1.6 GeV protons have been determined for Kr in Rb, Y, and Zr and for Xe in Ba and La. We present recent model calculations of Kr production for the different target elements in the sphere and a comparison with experimental data. Depth profiles of Kr production are now determined in the St. Severin (LL6) and Knyahinya (LS) chondrites. Calculated depth profiles will be considered for these two extensively studied meteorites and implications for other chondrites will be discussed.
Gilabert Eric
Herpers Ulrich
Lavielle Bernard
Lupke M.
Michel Rigo
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