Other
Scientific paper
May 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..23..219h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 23, Issue 3-4, pp.219-232
Other
10
Scientific paper
The iron meteorite Aroos fell on 24 November 1959. Using a sample received in February 1960, we have measured the content of eighteen cosmic-ray produced radioactive nuclides in this meteorite. All were separated by wet chemical methods. A low-level X-ray proportional counter was used for a group of electron-capture species; - and -counting were used for the others. The activities of the long-lived species Be 10 , Al 26 and Mn 53 were close to those found previously in the meteorites Williamstown and Grant. The value for Cl 36 was also consistent with earlier work. Much less K 40 was found, indicating a shorter cosmic-ray age for Aroos. Comparison of the activities of the groups Mn 53 -Mn 54 , Ti 44 -Sc 46 -Ca 45 , Na 22 -Al 26 , and C1 36 -Ar 37 -Ar 39 (data of and , 1960) indicates constancy of the cosmic-ray flux over millions of years within a factor of 2 or 3. Comparison of the groups Mn 54 -V 49 -Na 22 and Ti 44 -Si 32 , among others shows the great importance of low-energy particles in synthesizing products close to the target mass. Quantitative discussions will be given in a later paper.
Arnold James R.
Honda Masatake
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