Computer Science
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1859l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.1859-1869
Computer Science
4
Scientific paper
Changes in isotopic composition in the near-surface regions of stone and iron meteorites due to nuclear processes associated with the low-energy "solar" and "galactic" cosmic ray particles are evaluated theoretically. The processes considered are, nuclear-stopping due to ionization losses and nuclear-interactions . It is shown that these effects which are confined to the top few centimetres depth in meteorites are distinguishable from the more permeating isotopic changes induced by energetic galactic cosmic-rays. Their studies would allow one to estimate precisely the parameters characterizing the continuous flux of low-energy galactic cosmic-rays and the average flux of charged particles accelerated sporadically by the sun during the last tens to hundreds of million years. Combining such information with measurements of the prehistoric rates of accretion of certain nuclides, e.g. Al 26 , (based on analysis of deep sea sediments), it should become possible to deduce the terrestrial accretion rate of cosmic dust during the past few million years.
Lal Devendra
Rajan Sundar R.
Venkatavaradan V. S.
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