The Experts below are selected from a list of 5952 Experts worldwide ranked by ideXlab platform
Fernando De C. Da Silva - One of the best experts on this subject based on the ideXlab platform.
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Solution of the Doppler broadening function based on the fourier cosine transform
Annals of Nuclear Energy, 2008Co-Authors: Alessandro C. Gonçalves, Aquilino Senra Martinez, Fernando De C. Da SilvaAbstract:This paper provides a new integral representation for the Doppler broadening function ψ(ξ, x), which is interpreted as being a Fourier cosine transform. This integral form allows the obtaining of an analytical solution in a simple and accurate functional manner as regards the elementary functions. The solution obtained through the new integral representation can be widely used in several applications such as the calculation of self-shielding factors and measurement corrections for the Microscopic Cross Section through the activation technique.
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the derivation of the doppler broadening function using frobenius method
Journal of Nuclear Science and Technology, 2006Co-Authors: Daniel A.p. Palma, Aquilino Senra Martinez, Fernando De C. Da SilvaAbstract:An analytical approximation of the Doppler broadening function ψ(ξ,x) is proposed. This approximation is based on the solution of the differential equation for ψ(ξ,x) using the methods of Frobenius and parameters variation. The analytical form derived for ψ(ξ,x) in terms of elementary functions is very simple and precise. It can be useful for applications related to the treatment of nuclear resonances, mainly for calculations of multigroup parameters and resonances self-protection factors, the latter being used to correct Microscopic Cross Section measurements by the activation technique.
Daniel A.p. Palma - One of the best experts on this subject based on the ideXlab platform.
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the derivation of the doppler broadening function using frobenius method
Journal of Nuclear Science and Technology, 2006Co-Authors: Daniel A.p. Palma, Aquilino Senra Martinez, Fernando De C. Da SilvaAbstract:An analytical approximation of the Doppler broadening function ψ(ξ,x) is proposed. This approximation is based on the solution of the differential equation for ψ(ξ,x) using the methods of Frobenius and parameters variation. The analytical form derived for ψ(ξ,x) in terms of elementary functions is very simple and precise. It can be useful for applications related to the treatment of nuclear resonances, mainly for calculations of multigroup parameters and resonances self-protection factors, the latter being used to correct Microscopic Cross Section measurements by the activation technique.
P. Obložinský - One of the best experts on this subject based on the ideXlab platform.
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evaluation of tungsten isotopes in the fast neutron range including Cross Section covariance estimation
INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY 2007; NICE FRANCE; 20070422 through 20070427, 2007Co-Authors: Roberto Capote, Andrej Trkov, M Herman, B V Carlson, P. ObložinskýAbstract:New evaluations for the tungsten isotopes {sup 180,182,183,184,186}W in the neutron energy range up to 60 MeV were produced. In the resonance range only minor adjustments to the resonance parameters were made due to a lack of adequate experimental data. Evaluations in the fast energy region were based on nuclear model calculations using the EMPIRE-2.19 code. Recently derived dispersive coupled-channel optical model potentials for W and Ta isotopes were instrumental to achieve a very good description of the available Microscopic Cross-Section database. Model covariance data were generated with the Monte Carlo technique to produce a prior estimate for the covariance matrix. Experimental data were introduced through the GANDR system. The evaluated files were tested on selected fusion neutronics benchmarks and showed marked improvement compared to other existing evaluations.
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evaluation of tungsten isotopes in the fast neutron range including Cross Section covariance estimation
INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY 2007; NICE FRANCE; 20070422 through 20070427, 2007Co-Authors: Roberto Capote, Andrej Trkov, M Herman, B V Carlson, M Sin, P. ObložinskýAbstract:New evaluations for the tungsten isotopes {sup 180,182,183,184,186}W in the neutron energy range up to 60 MeV were produced. In the resonance range only minor adjustments to the resonance parameters were made due to a lack of adequate experimental data. Evaluations in the fast energy region were based on nuclear model calculations using the EMPIRE-2.19 code. Recently derived dispersive coupled-channel optical model potentials for W and Ta isotopes were instrumental to achieve a very good description of the available Microscopic Cross-Section database. Model covariance data were generated with the Monte Carlo technique to produce a prior estimate for the covariance matrix. Experimental data were introduced through the GANDR system. The evaluated files were tested on selected fusion neutronics benchmarks and showed marked improvement compared to other existing evaluations.
Aquilino Senra Martinez - One of the best experts on this subject based on the ideXlab platform.
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Solution of the Doppler broadening function based on the fourier cosine transform
Annals of Nuclear Energy, 2008Co-Authors: Alessandro C. Gonçalves, Aquilino Senra Martinez, Fernando De C. Da SilvaAbstract:This paper provides a new integral representation for the Doppler broadening function ψ(ξ, x), which is interpreted as being a Fourier cosine transform. This integral form allows the obtaining of an analytical solution in a simple and accurate functional manner as regards the elementary functions. The solution obtained through the new integral representation can be widely used in several applications such as the calculation of self-shielding factors and measurement corrections for the Microscopic Cross Section through the activation technique.
-
the derivation of the doppler broadening function using frobenius method
Journal of Nuclear Science and Technology, 2006Co-Authors: Daniel A.p. Palma, Aquilino Senra Martinez, Fernando De C. Da SilvaAbstract:An analytical approximation of the Doppler broadening function ψ(ξ,x) is proposed. This approximation is based on the solution of the differential equation for ψ(ξ,x) using the methods of Frobenius and parameters variation. The analytical form derived for ψ(ξ,x) in terms of elementary functions is very simple and precise. It can be useful for applications related to the treatment of nuclear resonances, mainly for calculations of multigroup parameters and resonances self-protection factors, the latter being used to correct Microscopic Cross Section measurements by the activation technique.
Roberto Capote - One of the best experts on this subject based on the ideXlab platform.
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evaluation of tungsten isotopes in the fast neutron range including Cross Section covariance estimation
INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY 2007; NICE FRANCE; 20070422 through 20070427, 2007Co-Authors: Roberto Capote, Andrej Trkov, M Herman, B V Carlson, P. ObložinskýAbstract:New evaluations for the tungsten isotopes {sup 180,182,183,184,186}W in the neutron energy range up to 60 MeV were produced. In the resonance range only minor adjustments to the resonance parameters were made due to a lack of adequate experimental data. Evaluations in the fast energy region were based on nuclear model calculations using the EMPIRE-2.19 code. Recently derived dispersive coupled-channel optical model potentials for W and Ta isotopes were instrumental to achieve a very good description of the available Microscopic Cross-Section database. Model covariance data were generated with the Monte Carlo technique to produce a prior estimate for the covariance matrix. Experimental data were introduced through the GANDR system. The evaluated files were tested on selected fusion neutronics benchmarks and showed marked improvement compared to other existing evaluations.
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evaluation of tungsten isotopes in the fast neutron range including Cross Section covariance estimation
INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY 2007; NICE FRANCE; 20070422 through 20070427, 2007Co-Authors: Roberto Capote, Andrej Trkov, M Herman, B V Carlson, M Sin, P. ObložinskýAbstract:New evaluations for the tungsten isotopes {sup 180,182,183,184,186}W in the neutron energy range up to 60 MeV were produced. In the resonance range only minor adjustments to the resonance parameters were made due to a lack of adequate experimental data. Evaluations in the fast energy region were based on nuclear model calculations using the EMPIRE-2.19 code. Recently derived dispersive coupled-channel optical model potentials for W and Ta isotopes were instrumental to achieve a very good description of the available Microscopic Cross-Section database. Model covariance data were generated with the Monte Carlo technique to produce a prior estimate for the covariance matrix. Experimental data were introduced through the GANDR system. The evaluated files were tested on selected fusion neutronics benchmarks and showed marked improvement compared to other existing evaluations.