We have measured gamma rays emanating from radionuclides produced by cosmic ray interactions in two fragments of Gebel Kamil iron meteorite. Based on the cosmogenic 26 Al activity, it is deduced that one fragment, taken from the narrow edge of the mace-shaped main mass, was exposed close to the surface and the other fragment was located about 73 cm deep inside the meteoroid. No signal due to 44 Ti was detected indicating that it has totally decayed on the Earth after fall of the meteorite and the terrestrial age of the meteorite must be longer than a few centuries. The ablation is shown to be asymmetric around the centre of the meteoroid and the pre-atmospheric mass of the meteoroid has been estimated to be between 30 and 60 tons, consistent with other estimates.
Cosmic ray effects in the iron meteorite Gebel Kamil and its asymmetric ablation
Taricco C.
First
;Colombetti P.;Rubinetti S.;Barghini D.;
2019-01-01
Abstract
We have measured gamma rays emanating from radionuclides produced by cosmic ray interactions in two fragments of Gebel Kamil iron meteorite. Based on the cosmogenic 26 Al activity, it is deduced that one fragment, taken from the narrow edge of the mace-shaped main mass, was exposed close to the surface and the other fragment was located about 73 cm deep inside the meteoroid. No signal due to 44 Ti was detected indicating that it has totally decayed on the Earth after fall of the meteorite and the terrestrial age of the meteorite must be longer than a few centuries. The ablation is shown to be asymmetric around the centre of the meteoroid and the pre-atmospheric mass of the meteoroid has been estimated to be between 30 and 60 tons, consistent with other estimates.
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