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Preliminary evaluation of neutron capture cross sections for /sup 144/Sm, /sup 145/Sm and /sup 145/Pm [electronic resource].

Published:
Livermore, Calif : Lawrence Livermore National Laboratory, 1986.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 20 : digital, PDF file
Additional Creators:
Lawrence Livermore National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We have made preliminary neutron-capture cross-section calculations of the Hauser-Feshbach type for the isotopes /sup 144/Sm, /sup 145/Sm, and /sup 145/Pm to investigate the production of radioactive /sup 145/Pm by neutron capture on the stable isotope /sup 144/Sm. The calculations were made for incident neutron energies from 2.5 MeV to about 1/sup -4/ or 10/sup -5/ MeV, wherever the first unbound resonance was estimated to occur in each case. At that energy, the calculated value was reduced by a somewhat arbitrary factor, and the excitation function extended down to thermal energy using a (E/sub n/)/sup -1/2/ energy dependence. Since very large uncertainties are associated with the position and magnitude of the first unbound resonance and the subsequent extrapolation back to thermal energy, the cross sections in this low-energy region should not be considered more accurate than +- a factor of 10. For incident neutron energies above each step, the calculations represent an average through the separated and overlapping resonance regions and may be accurate to better than +- a factor of 2. 18 refs., 7 figs., 5 tabs.
Report Numbers:
E 1.99:ucid-20577
ucid-20577
Subject(s):
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Note:
Published through SciTech Connect.
02/13/1986.
"ucid-20577"
"DE86008148"
Gardner, D.G.; Gardner, M.A.
Funding Information:
W-7405-ENG-48
View MARC record | catkey: 14672611