Neutron capture effects in Gd from the Norton County meteorite

Creators: Eugster, O.; Tera, F.; Burnett, D. S.; Wasserburg, G. J.

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Abstract

The isotopic composition of Gd in one chondrite, two achondrites and the silicate inclusions of two meteorites have been determined. When corrected for mass discrimination, Gd in all samples except the Norton County achondrite shows the same relative isotopic abundances as terrestrial Gd. These results set an upper limit of 3 × 10¹⁵ neutrons per cm² on a differential integrated thermal neutron irradiation of the earth and these meteorites. Neutron capture effects are present in Gd extracted from the Norton County achondrite. These most probably have been produced by secondary neutrons during the exceptionally long cosmic ray exposure of this large stone meteorite. The isotopic anomalies correspond to an integrated thermal neutron flux of (6.3 ± 0.9) × 10¹⁵ neutrons per cm².

Additional Information

© 1970 Published by Elsevier B.V. Received 10 November 1969. We wish to thank Hannelore and Uwe Derksen for their able technical assistance. We are grateful to our colleagues who supplied meteorite samples used in this work: Norton County, Pasamonte, Forest City and Weekeroo Station were obtained from the Nininger Meteorite Collection at the Arizona State University through the aid of C.B. Moore. Copiapo was supplied by Drs. P.P ellas, J. Orcel and F. Kraut of the Paris National History Museum. This work was supported by the National Science Foundation GP 9433 and GP 9114.

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