Cosmogenic MN53 in Meteorites
Abstract
The distributions of the Mn53 contents in 106 nonantarctic and 112 antarctic chondrites were analyzed. A correlation analysis of these distributions showed that the correlation coefficient is a maximum r_{max} = 0.75 plus or minus 0.03) when the histogram for antarctic chondrites is displaced by 40 plus or minus 8 dpm kg1Fe towards lower Mn53 contents. The distribution of Mn53 saturated contents in nonantarctic ordinary chondrites was investigated as a function of their radiation age (T). It is found that the Mn53 average content is higher by (21 plus or minus 9)% in Hchondrites with radiation age T approximately 12 Myr than in thse with T 12 Myr. This effect can be attributed to the fact that a considerable proportion of Hchondrites with T 12 Myr originates from a comet or from the objects of Chiron like, with the orbits more inclined to the ecliptic plane and/or more extended, which caused their irradiation by cosmic rays of higher intensity.
 Publication:

19th International Cosmic Ray Conference (ICRC19), Volume 5
 Pub Date:
 August 1985
 Bibcode:
 1985ICRC....5..418A
 Keywords:

 Chondrites;
 Cosmic Rays;
 Distribution (Property);
 Manganese Isotopes;
 Antarctic Regions;
 Comets;
 Correlation Coefficients;
 Histograms;
 Space Radiation