Nuclear Data (ND)
NUCLEAR DATA AND MEASUREMENTS REPORTS
Reports 161- 180
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ANL/NDM-161 | Complete PDF file (1.80 MB)
Neutron Scattering from the Standard 197Au
Alan B. Smith
July 2005
Differential neutron "elastic scattering" cross sections of elemental gold
are measured from ≈ 4.5 - 10.0 MeV at
incident-neutron energy intervals of ≈ 0.5 MeV.
These results are combined with those of previous and lower-energy work by
the author and associates to form a neutron-scattering database extending
from ≈ 0.3 - 10.0 MeV. This database is augmented
with several additional scattering distributions and with detailed neutron
total cross sections from the literature. The resulting composite database
is interpreted in terms of optical-statistical, dispersion and
coupled-channels models. The results are compared with relevant models in
the literature, and a collective rotational model for the prediction of
neutron interactions in this mass-energy region is proposed. The
experimental and model results are compared with relevant portions of the
ENDF/B-VI gold evaluated nuclear data file. Future work is suggested.
KEYWORDS:
Measured neutron dσ/Ωel
for 197Au,4.5 → 10.0 MeV.
Optical-statistical, coupled-channels, dispersion and "regional" models.
Comparisons with ENDF/B-VI
ANL/NDM-162 | Complete PDF file (1.9
MB)
Evaluated Decay Data for 206Tl
Filip G. Kondev
December 2006
Evaluated decay data for the 206Tl nuclide are presented,
including recommended values for the half-life, β− and γ−ray emission
energies and probabilities. Data on X-ray radiations, Auger and
conversion electron energies and emission probabilities are also
tabulated.
ANL/NDM-163 | Complete
PDF file (2.8
MB)
Remark on:- The Neutron Spherical Optical-Model Absorption
Alan B. Smith
January 2007
The energy-dependent behavior of the absorption term of the spherical
neutron optical potential for doubly magic 208Pb and the
neighboring 209Bi is examined. These considerations suggest a
phenomenological model with an intuitively attractive energy dependence
of the imaginary potential that provides a good description of the
observed neutron cross sections and that is qualitatively consistent with
theoretical concepts. At the same time it provides an alternative to some
of the arbitrary assumptions involved in many conventional optical model
interpretations reported in the literature and reduces the number of the
parameters of the model.
KEYWORDS:
The properties of the optical-statistical and coupled-channels models in
the region of the doubly closed shell at A = 208 are examined with
particular attention to the energy dependence of the imaginary potential.
A new imaginary potential shape is proposed.
ANL/NDM-164 | Complete
PDF file (1
MB)
Evaluated Decay Data for 246Cm
Filip G. Kondev
February 2007
Evaluated decay data for the 246Cm nuclide are presented,
including recommended values for the half-life, α− and γ−ray emission
energies and probabilities. Data on X-ray radiations, Auger and
conversion electron energies and emission probabilities are also
tabulated.
ANL/NDM-165
Alan B. Smith
To be Published
ANL/NDM-166 | Complete
PDF file (481 KB)
A Unified Monte Carlo Approach to Fast Neutron Cross Section Data
Evaluation
Donald L. Smith
January 2008
A unified Monte Carlo (UMC) approach to fast neutron cross section data
evaluation that incorporates both model-calculated and experimental
information is described. The method is based on applications of Bayes
Theorem and the Principle of Maximum Entropy as well as on fundamental
definitions from probability theory. This report describes the formalism,
discusses various practical considerations, and examines a few numerical
examples in some detail.
KEYWORDS:
NUCLEAR DATA EVALUATION. Monte-Carlo. Probability. Bayes Theorem.
Experimental uncertainties. Nuclear modeling uncertainties. Covariances.
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