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Neutron capture on ¹⁴⁹Sm in lunar samples

Russ, G. P., III and Burnett, D. S. and Lingenfelter, R. E. and Wasserburg, G. J. (1971) Neutron capture on ¹⁴⁹Sm in lunar samples. Earth and Planetary Science Letters, 13 (1). pp. 53-60. ISSN 0012-821X. doi:10.1016/0012-821x(71)90104-x.

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High precision isotopic composition measurements of Sm have been carried out for two terrestrial and seven lunar samples from three Apollo sites. The lunar samples, selected to show a wide variation in cosmic ray exposure ages, have a wide range of enrichments in ¹⁵⁰Sm/¹⁵⁴Sm (up to 0.8%) and depletions in ¹⁴⁹Sm/¹⁵⁴Sm which are due to neutron capture. The ratio of the number of neutrons captured per atom by ¹⁴⁹Sm to ¹⁵⁷Gd is 0.9 and reflects a hardened lunar neutron spectrum. This ratio is in reasonable but not exact agreement with that obtained from the theoretical lunar neutron energy spectrum of Lingenfelter, Canfield and Hampel. The average composition for terrestrial samarium is ¹⁴⁴Sm : ¹⁴⁷Sm : ¹⁴⁸Sm : ¹⁴⁹Sm : ¹⁵⁰Sm : ¹⁵²Sm : ¹⁵⁴Sm = 3.074 : 14.995 : 11.243 : 13.820 : 7.380 : 26.739 : 22.749%.

Item Type:Article
Related URLs:
URLURL TypeDescription
Burnett, D. S.0000-0001-9521-8675
Wasserburg, G. J.0000-0002-7957-8029
Alternate Title:Neutron capture on 149Sm in lunar samples
Additional Information:Discussions with F. Tera and J. Huneke were very beneficial. This work was supported by the National Science Foundation under Grant GP-28027 and in part by NASA Contract NGL-05-002-188. One of us (G.P.R.) is supported by a National Defense Education Act, Title IV, Fellowship and his wife.
Group:Division of Geological and Planetary Sciences
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National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences2067
Issue or Number:1
Record Number:CaltechAUTHORS:20221121-280779900.3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117918
Deposited By: Tony Diaz
Deposited On:29 Nov 2022 18:37
Last Modified:29 Nov 2022 18:37

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