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Validation of aggregate delayed neutron spectra calculated from precursor data [electronic resource].

Published:
Washington, D.C : United States. Dept. of Energy. Office of Energy Research, 1989.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: (12 pages) : digital, PDF file
Additional Creators:
Los Alamos National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
An extensive reference library of delayed neutron data has been compiled which contains fission yields and branchings, delayed neutron emission probabilities, and spectra for 271 precursors. These data have been used to calculate the aggregate behavior of delayed neutrons following a fission event in 43 fissioning systems. Least-squares techniques were used to produce fitted decay constants and abundances in the conventional six-group formalism from these calculated activity curves. A consistent set of six-group spectra have also been calculated for each of the fissioning systems. Recent measurements at the University of Lowell have produced measured energy spectra for delayed neutrons following the thermal fission (T) of ²³⁵U and ²³⁹Pu, and the fast fission (F) of ²³⁸U. These measured spectra provide data that may be used to validate the precursor data base and the fitted six-group data. This summary presents results of this validation effort. Both the individual precursor data and the six-group data have been used to calculate aggregate equilibrium spectra for ²³⁵U(T), ²³⁸U(F), and ²³⁹Pu(T) via summation techniques. The important precursors in each case are identified, and the status of their data reviewed. 8 refs., 3 figs., 3 tabs.
Report Numbers:
E 1.99:la-ur-89-3386
E 1.99: conf-900418--2
conf-900418--2
la-ur-89-3386
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
01/01/1989.
"la-ur-89-3386"
" conf-900418--2"
"DE90002390"
International conference on the physics of reactors: operation, design and computation, Marseilles (France), 23-26 Apr 1990.
Brady, M. C.; England, T. R.
JAERI
Funding Information:
W-7405-ENG-36
AC05-84OR21400
View MARC record | catkey: 14671092