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Neutron capture on Sm-149 in lunar samples.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 Sm-150/Sm-154 (up to 0.8%) and depletions in Sm-149/Sm-154 which are due to neutron capture. The ratio of the number of neutrons captured per atom by Sm-149 to Gd-157 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 given.
Document ID
19720040490
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/0012-821X(71)90104-X
Authors
Russ, G. P., III
Burnett, D. S.
Wasserburg, G. J. (California Institute of Technology Pasadena, Calif., United States)
Lingenfelter, R. E. (California Institute of Technology, Pasadena; California, University Los Angeles, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
December 1, 1971
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 13
Issue: 1, De
Subject Category
Space Sciences
Accession Number
72A24156
Funding Number(s)
CONTRACT_GRANT: NSF GP-28027
CONTRACT_GRANT: NGL-05-002-188
Distribution Limits
Public
Copyright
Other

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