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Title: Final evaluated 239Pu(n500keV,f) PFNS and uncertainties and test evaluations

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
DOE/LANL
OSTI Identifier:
1150662
Report Number(s):
LA-UR-14-26710
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
Nuclear Physics & Radiation Physics(73); Atomic and Nuclear Physics

Citation Formats

Neudecker, Denise. Final evaluated 239Pu(n500keV,f) PFNS and uncertainties and test evaluations. United States: N. p., 2014. Web. doi:10.2172/1150662.
Neudecker, Denise. Final evaluated 239Pu(n500keV,f) PFNS and uncertainties and test evaluations. United States. doi:10.2172/1150662.
Neudecker, Denise. Tue . "Final evaluated 239Pu(n500keV,f) PFNS and uncertainties and test evaluations". United States. doi:10.2172/1150662. https://www.osti.gov/servlets/purl/1150662.
@article{osti_1150662,
title = {Final evaluated 239Pu(n500keV,f) PFNS and uncertainties and test evaluations},
author = {Neudecker, Denise},
abstractNote = {},
doi = {10.2172/1150662},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 26 00:00:00 EDT 2014},
month = {Tue Aug 26 00:00:00 EDT 2014}
}

Technical Report:

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  • We calculate the total kinetic and excitation energies of fragments produced in the thermal-induced fission of {sup 239}Pu. This result is a proof-of-principle demonstration for a microscopic approach to the calculation of fission-fragment observables for applied data needs. In addition, the calculations highlight the application of a fully quantum mechanical description of scission, and the importance of exploring scission configurations as a function of the moments of the fragments, rather than through global constraints on the moments of the fissioning nucleus. Using a static microscopic calculation of configurations at and near scission, we have identified fission fragments for the {supmore » 239}Pu (n{sub th}, f) reaction and extracted their total kinetic and excitation energies. Comparison with data shows very good overall agreement between theory and experiment. Beyond their success as a proof of principle, these calculations also highlight the importance of local constraints on the fragments themselves in microscopic calculations.« less
  • The cumulative fission yields of the four nuclides 95Zr, 99Mo, 144Ce and 147Nd are key parameters in estimating the effects from nuclear tests and for post-detonation nuclear forensics in general. Driven particularly by differences in the fission yields from 239Pu(n,f) that have been in use by LLNL and LANL over the years, an intensive effort has been undertaken to evaluate the current state of our knowledge of these yields and to provide a basis for projecting yields to those applicable to forensics. The neutron spectrum producing fission in the Jezebel critical assembly (< E n > ~ 1.9 MeV) maymore » be taken as a reasonable reference. It is desired to know the cumulative fission yields to a total uncertainty (1σ) of ± 2.5%.« less