26Al in iron meteorites and the constancy of cosmic ray intensity in the past |
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Authors: | W Hampel OA Schaeffer |
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Institution: | Max-Planck-Institut für Kernphysik, Heidelberg Federal Republic of Germany |
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Abstract: | Cosmic-ray-produced26Al in iron meteorites has been measured by low-level γγ-coincidence counting. The26Al activities, in dpm/kg, are: Aroos3.0 ± 1.0, Braunau2.6 ± 0.5. Kayakent4.6 ± 1.5, N'Goureyma4.4 ± 1.1, Okahandja3.6 ± 0.9, Treysa4.0 ± 0.5. Exposure ages based on26Al/21Ne are in agreement, within experimental error(±20%), with those based on36Cl/36Ar and39Ar/38Ar but the ages based on40K/41K are higher by about 50%. The difference in exposure ages is probably caused by a real change of the cosmic ray intensity in the inner solar system. |
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