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Title: Revisiting Nuclear Fission Data for Nonproliferation Applications

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1329602
Report Number(s):
LA-UR-16-27413
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: Advances in Nuclear Nonproliferation Technology & Policy Conference ; 2016-09-26 - 2016-09-30 ; Santa Fe, New Mexico, United States
Country of Publication:
United States
Language:
English
Subject:
Atomic and Nuclear Physics

Citation Formats

Talou, Patrick. Revisiting Nuclear Fission Data for Nonproliferation Applications. United States: N. p., 2016. Web.
Talou, Patrick. Revisiting Nuclear Fission Data for Nonproliferation Applications. United States.
Talou, Patrick. 2016. "Revisiting Nuclear Fission Data for Nonproliferation Applications". United States. doi:. https://www.osti.gov/servlets/purl/1329602.
@article{osti_1329602,
title = {Revisiting Nuclear Fission Data for Nonproliferation Applications},
author = {Talou, Patrick},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Conference:
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  • A review of the various nuclear models used in the evaluation of neutron nuclear data for fission and fusion reactors is presented. Computer codes embodying the principles of the relevant nuclear models are compared with each other and with experimental data. The regions of validity and limitations of the conceptual formalisms are also included, along with the effects of the numerical procedures used in the codes themselves. Conclusions and recommendations for future demands are outlined.15 tables, 15 figures, 90 references. (auth)
  • In the nuclear safeguards and arms control areas, well-developed methodologies exist for determining the properties of nuclear materials via measurements of the gamma rays and neutrons emitted from these materials, or in the arms control area, by the use of radiography. In certain favorable instances, it may by feasible to perform comparable measurements with the use of a ubiquitous, naturally-occurring radiation--cosmic ray mu mesons (muons). At the earth`s surface these charged particles have a broad energy distribution peaking at about 500 MeV with a flux of approximately 10{sup {minus}2}/cm{sup 2}-sec-steradian. In traversing matter, muons lose energy at a rate ofmore » approximately 2 MeV/gram almost independent of atomic number. Muons can readily be detected by either plastic scintillators or wire planes. While the flux is small, a scintillator of one meter area, for example, will register about 20,000 events/min. these particles should have utility in the detection and imaging of objects with sectional densities of a few hundred grams/cm{sup 2}. The degree of intrusiveness of the imaging can be controlled through the detector configuration. Some possible applications include: (1) mass measurements on large UF{sub 6} cylinders, (2) determination of the size of treaty-limited objects, e.g., missiles, in rail cars or other containment; (3) verification of single or multiple warheads or components; (4) the detection of concealed, underground cavities. Examples will be presented.« less
  • Abstract not provided.
  • Fission reactors continue to play a significant role in the energy, medical, military, analytical, and research activities around the world. To use them effectively, it is necessary to monitor their neutron levels and distributions, their radioactive products, and the reaction rates in their fuel, control, moderator, coolant, structural, and target materials. Nuclear data associated with these materials as well as the materials used as monitors are vitally important in providing data to the operations, experiments, analyses, productions, and surveillance sectors of nuclear technology, science, and engineering. This paper reviews the isotopic abundance, cross-section, decay, and yield data of selected materialsmore » and reaction products being applied by the author's laboratory in measurements related to fission reactors.« less
  • Neutron total and scattering cross sections of elemental bismuth are measured to energies of approximately 4.5 MeV. The experimental results are used to deduce an optical-statistical model that is quantitatively descriptive of the measured values and of higher-energy results reported in the literature. The measured and calculated values, together with the body of information available in the literature, are utilized to derive a comprehensive evaluated nuclear data file in the ENDF format. This evaluation extends from 10/sup -5/ eV to 20 MeV, addresses neutron-induced and photon-emission processes, and is oriented toward the needs of fusion-fission-hybrid and electro-nuclear breeding applications. 4more » figures, 1 table.« less