# Nuclear Data Program

## NUCLEAR DATA AND MEASUREMENTS REPORTS

### Reports 161-180

**ANL/NDM-161** | 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 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/Ω

_{el}for

^{197}Au,4.5 → 10.0 MeV. Optical-statistical, coupled-channels, dispersion and "regional" models. Comparisons with ENDF/B-VI

**ANL/NDM-162** | Complete PDF file (1.9MB)

**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 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 (2.6MB)

**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 ^{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 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 (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 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** | 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 incident-neutron energies of ≈ 50 MeV. These results were interpreted
in terms of spherical optical and vibrational coupled-channels models, assuming elemental Calcium is
essentially the isotope Ca-40, doubly magic with equal numbers of neutrons and protons (20) and thus
has zero iso-spin. 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 doubly-magic, iso-spin zero, Ca-40 are considered. Comparisons of experimental and evaluated quantities and, spherical and vibrational model predictions are discussed. An energy dependent asymmetric shape of the surface-imaginary absorption is proposed.

**ANL/NDM-166** | 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 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.

**ANL/NDM-167** | Complete PDF file (1.2MB)

**Total Absorption Gamma-ray Spectrometer (TAGS) Simulations with GEANT4**

*Michael L. Smith*

November 2010

This project aims to study the structure of neutron-rich fission products of importance to Advanced Fuel Cycle applications. The measurement of ß-decay feeding intensities is made possible through the use of the Total Absorption Gamma-ray 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. β-decay feeding
intensities. Total Absorption Gamma-ray Spectrometer. Monte Carlo.

**ANL/NDM-168** | Complete PDF
file (1.2MB)

**Report on the Workshop "Decay Spectroscopy at CARIBU: Advanced Fuel Cycle Applications, Nuclear
Structure and Astrophysics", April 14-16, 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,

*University of Surrey*

^{4}The primary aims of the CARIBU workshop were to stimulate interest
in, and discuss the opportunities for, nuclear physics studies at the __CA__lifornium __R__are __I__sotope __B__reeder
__U__pgrade (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.

**« Go to: **[
NDM Reports Index ]
[ Nuclear Data Home ]

Last Modified: Thu, April 21, 2016 5:04 AM