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Unified Monte Carlo and Mixed Probability Functions
R. Capote,D. L. Smith 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The possibility of using the recently suggested Unified Monte Carlo (UMC) technique for the evaluation of nuclear reaction data other than those that are normally distributed is discussed in this paper. The alternative probability distributions examined here are: 1) lognormal distribution; 2) uniform interval distribution; and 3) exponential distribution. These distributions, together with the normal distribution, are capable of addressing most situations that are likely to be encountered in evaluating nuclear reaction data. The mathematical formalism is described and numerical examples are provided showing instances when the UMC method can lead to results which are quite different from those obtained using the Generalized Least Squares (GLS) method. We conclude that: 1) the GLS method gives reasonable results comparable to UMC for probability functions closely resembling symmetric normal distributions with small to modest uncertainties, but the UMC results are more reliable for broad or strongly asymmetric distributions; 2) the lognormal distribution can be used to good advantage in certain situations involving large uncertainties; 3) use of the uniform and exponential distributions by evaluators should be discouraged.
Sirakov, I.,Capote, R.,Gritzay, O.,Kim, H. I.,Kopecky, S.,Kos, B.,Paradela, C.,Pronyaev, V. G.,Schillebeeckx, P.,Trkov, A. Springer 2017 European Physical Journal A Vol.53 No.10
<P>Cross sections for neutron interactions with U-238 in the energy region from 5 keV to 150 keV have been evaluated. Average total and capture cross sections have been derived from a least squares analysis using experimental data reported in the literature. The resulting cross sections have been parameterised in terms of average resonance parameters maintaining full consistency with results of optical model calculations by using a dispersive coupled channel optical model potential. The average compound partial cross sections have been expressed in terms of transmission coefficients by applying the Hauser-Feshbach statistical reaction theory including width-fluctuations. A generalized single-level representation compatible with the energy-dependent options of the ENDF-6 format has been applied using standard boundary conditions. The results have been transferred into a full ENDF-6 compatible data file.</P>
A. Trkov,I. Kodeli,G. Zerovnik,R. Capote,D. W. Muir 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Taking the FNG-W benchmark with a D-T source in front of a large tungsten block as an example, the impact of the reaction cross-section covariance data on the predicted activities of monitor foils inside the block and the associated uncertainties were studied. Cross-material covariances between the isotopic cross sections of tungsten were obtained by including experimental measurements of the elemental total cross sections above the resonance range. Cross-material covariances of the elastic and the radiative capture reactions were considered. Since the original cross sections were evaluated accurately from the reasonably abundant isotopic data, the impact of introducing elemental data on the isotopic cross sections and their uncertainties were small. Correlations were observed mainly in the elastic channel, which has a relatively low sensitivity to the calculated monitor activities of the benchmark. Consequently, the impact on the predicted monitor sample activities was also small in terms of the absolute value and the uncertainty. The main achievement of the work was the demonstrated data consistency and the development of tools for including elemental data in isotopic cross section evaluation and the evaluation of cross-material covariances.
Towards Improved Evaluation of Neutron-Induced Fission Cross Section
S. Goriely,S. Hilaire,A. J. Koning,R. Capote 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Mean-field calculations can nowadays provide all the nuclear ingredients required to describe the fission path from the equilibrium deformation up to the nuclear scission point. The information obtained from microscopic mean-field models has been included in reaction codes to improve the predictions of neutron-induced fission cross section. The nuclear inputs concern not only the details of the energy surface along the fission path, but also the coherent estimate of the nuclear level density derived within the combinatorial approach on the basis of the same single-particle properties, in particular at the fission saddle points. The predictive power of such a microscopic approach is tested. It is also shown that the various inputs can be tuned to reproduce at best experimental data in one unique coherent framework, so that it is now possible to make reliable and accurate fission cross-section calculations on the basis of microscopic models, but also to use such approaches to estimate the corresponding modeling uncertainties for nuclei, energy ranges or reaction channels for which no data exist.
Renewed Database of GDR Parameters for Atomic Nuclei
V. A. Plujko,O. M. Gorbachenko,V. M. Bondar,R. Capote 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Updated values of giant dipole resonance parameters with uncertainties are presented which were obtained by a chi-square fit of the theoretical photoabsorption cross sections to the experimental data. Renewed systematics for giant dipole resonance parameters are given. Different Lorentzian-type models of dipole strength functions are tested by comparison of the calculations with experimental data. It is demonstrated that closed-form approaches with asymmetric shape of the gamma strength provide the most reliable simple method for estimation of the γ-decay.
Recommended nuclear data for medical radioisotope production: diagnostic positron emitters
Tá,rká,nyi, F. T.,Ignatyuk, A. V.,Hermanne, A.,Capote, R.,Carlson, B. V.,Engle, J. W.,Kellett, M. A.,Kibé,di, T.,Kim, G. N.,Kondev, F. G.,Hussain, M.,Lebeda, O.,Luca, A.,Nagai, Y.,Na Springer-Verlag 2019 Journal of Radioanalytical and Nuclear Chemistry Vol.319 No.2