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Neutron capture on Gd and Sm in the Luna 16, G-2 soil

Russ, G. Price (1972) Neutron capture on Gd and Sm in the Luna 16, G-2 soil. Earth and Planetary Science Letters, 13 (2). pp. 384-386. ISSN 0012-821X. doi:10.1016/0012-821x(72)90113-6.

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The Gd and Sm isotopic compositions have been measured in the Luna 16, G-2 soil. This sample has the largest low energy neutron fluence ψ = 5.9 × 10¹⁶n/cm² (E < 0.18 eV) yet observed in a lunar sample. The ratio of the number of neutrons captured per atom by ¹⁴⁹Sm to ¹⁵⁷Gd is 0.76 which is distinct from the value of 0.86 observed at the Apollo 11, 12 and 14 sites. This indicates a softer neutron energy spectrum at the Sea of Plenty.

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Additional Information:I thank the Soviet Academy of Sciences and The National Aeronautics and Space Administration for arranging for the exchange of lunar samples and the Lunar Sample Analysis Planning Team for entrusting the Lunatic Asylum with this sample. I am indebted to G. J. Wasserburg and D. S. Burnett for their continuing support, supervision, and consultation. This work was supported by NASA Contract NGL-05-002-188 and National Science Foundation grant GP-28027. The author is supported by an NDEA Fellowship.
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Caltech Division of Geological and Planetary Sciences2102
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ID Code:117975
Deposited By: Tony Diaz
Deposited On:01 Dec 2022 18:27
Last Modified:01 Dec 2022 18:27

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