Nuclear Data Program
NUCLEAR DATA AND MEASUREMENTS REPORTS

Reports 161180
ANL/NDM161  Complete PDF file (1.8MB)
Neutron Scattering from the Standard ^{197}Au
Alan B. Smith
July 2005
Differential neutron "elastic scattering" cross sections of elemental gold
are measured from ≈ 4.5  10.0 MeV at
incidentneutron energy intervals of ≈ 0.5 MeV.
These results are combined with those of previous and lowerenergy work by
the author and associates to form a neutronscattering 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 opticalstatistical, dispersion and
coupledchannels models. The results are compared with relevant models in
the literature, and a collective rotational model for the prediction of
neutron interactions in this massenergy region is proposed. The
experimental and model results are compared with relevant portions of the
ENDF/BVI gold evaluated nuclear data file. Future work is suggested.
KEYWORDS:
Measured neutron dσ/Ω_{el} for ^{197}Au,4.5 → 10.0 MeV.
Opticalstatistical, coupledchannels, dispersion and "regional" models.
Comparisons with ENDF/BVI
ANL/NDM162  Complete PDF file (1.9MB)
Evaluated Decay Data for ^{206}Tl
Filip G. Kondev
December 2006
Evaluated decay data for the ^{206}Tl nuclide are presented,
including recommended values for the halflife, β− and γ−ray emission
energies and probabilities. Data on Xray radiations, Auger and
conversion electron energies and emission probabilities are also
tabulated.
ANL/NDM163  Complete PDF file (2.6MB)
Remark on: The Neutron Spherical OpticalModel Absorption
Alan B. Smith
January 2007
The energydependent behavior of the absorption term of the spherical
neutron optical potential for doubly magic ^{208}Pb and the
neighboring ^{209}Bi 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 opticalstatistical and coupledchannels 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/NDM164  Complete PDF file (969KB)
Evaluated Decay Data for ^{246}Cm
Filip G. Kondev
February 2007
Evaluated decay data for the ^{246}Cm nuclide are presented,
including recommended values for the halflife, α− and γ−ray emission
energies and probabilities. Data on Xray radiations, Auger and
conversion electron energies and emission probabilities are also
tabulated.
ANL/NDM165  Complete PDF
file (1.1MB)
Fast Neutron, Calcium, Models and Potentials
Alan B. Smith
September 2010
The experimental neutron cross sections of elemental Calcium were assembled
from the world data centers up to incidentneutron energies of ≈ 50 MeV. These results were interpreted
in terms of spherical optical and vibrational coupledchannels models, assuming elemental Calcium is
essentially the isotope Ca40, doubly magic with equal numbers of neutrons and protons (20) and thus
has zero isospin. The model results are compared with various evaluated files and with the predictions
of the calculational systems widely used in evaluations.
KEYWORDS:
Fast neutrons incident on doublymagic, isospin zero, Ca40 are considered. Comparisons of experimental and evaluated quantities and, spherical and vibrational model predictions are discussed. An energy dependent asymmetric shape of the surfaceimaginary absorption is proposed.
ANL/NDM166  Complete PDF file (481KB)
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 modelcalculated 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. MonteCarlo. Probability. Bayes Theorem.
Experimental uncertainties. Nuclear modeling uncertainties. Covariances.
ANL/NDM167  Complete PDF file (1.2MB)
Total Absorption Gammaray Spectrometer (TAGS) Simulations with GEANT4
Michael L. Smith
November 2010
This project aims to study the structure of neutronrich fission products of importance to Advanced Fuel Cycle applications. The measurement of ßdecay feeding intensities is made possible through the use of the Total Absorption Gammaray Spectrometer (TAGS) method, utilising a large NaI scintillator detector. The method relies heavily on the modelling of the detector response using a Monte Carlo model. This report looks at the progress of developing such a model (using Geant4) and the other considerations required to implement the TAGS method.
KEYWORDS:
NUCLEAR DATA EVALUATION. Advanced Fuel Cycle. βdecay feeding
intensities. Total Absorption Gammaray Spectrometer. Monte Carlo.
ANL/NDM168  Complete PDF
file (1.2MB)
Report on the Workshop "Decay Spectroscopy at CARIBU: Advanced Fuel Cycle Applications, Nuclear
Structure and Astrophysics", April 1416, 2011, Argonne National Laboratory, USA
M.P. Carpenter^{1}, P. Chowdhury^{2}, J.A. Clark^{1}, F.G. Kondev^{3}, C.J. Lister^{1}, A.L. Nichols^{4} and D. Seweryniak^{1}
July 2011
^{1} Physics Division, Argonne National Laboratory, ^{2} University of Massachusetts Lowell, ^{3} Nuclear Engineering Division, Argonne National Laboratory, ^{4} University of Surrey
The primary aims of the CARIBU workshop were to stimulate interest
in, and discuss the opportunities for, nuclear physics studies at the CAlifornium Rare Isotope Breeder
Upgrade (CARIBU) ion source at the ATLAS facility. Particular emphasis was placed on advance fuel cycle
(AFC), nuclear structure and astrophysics research studied through decay studies of fission fragments.
The workshop was attended by over 70 nuclear physicists from around the world (of which approximately
20 came from Argonne National Laboratory).
KEYWORDS:
CARIBU. Advanced Fuel Cycle. Nuclear Structure. Astrophisics. Nuclear Physics Studies. Decay Studies
of Fission Fragments.
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