Computer Science
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...15p&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 6, p. (6)15-(6)24
Computer Science
1
Abundance, Calibrating, Energy Distribution, Flux Density, Galactic Cosmic Rays, Meteorites, Olivine, Particle Tracks, Annealing, Etching, Particle Acceleration, Spatial Distribution
Scientific paper
The new approach to the problem of investigation of charge and energy spectra of ultra heavy Galactic cosmic ray nuclei, based on a fossil track study of extraterrestrial olivine crystals was proposed. The results of an investigation of ultra heavy Galactic cosmic ray nuclei (50 less than or = Z less than or = 92) in meteoritic olivine crystals are presented. The technique was based on calibration to these crystals with accelerated Xe, Au, Pb and U ions and partial annealing of 'fresh' and 'fossil' tracks. It allows us to get first the charge spectra of Galactic cosmic ray nuclei based on fossil track length study in meteoritic and Moon crystals. The comparative studies of the spectra of 'fossil' tracks and tracks due to Pb-208 and U-238 nuclei have shown that the group of 210 micrometers 'fossil' tracks observed in 1980 at LNR, JINR due to TH-U nuclei -- products of recent r-process nucleosynthesis in our Galaxy. The method in principle allows one to resolve Pt-Pb peaks in fossil tracks, to establish the upper limit of the abundances of Z greater than 110 nuclei in the Galactic cosmic rays at the level less than or = 10-3 to the abundance of actinide nuclei and to get information about the history of Z greater than 50 cosmic rays in the time interval up to 220 M. A.
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