Comparison of algorithms for Doppler broadening pointwise tabulated cross sections

2015 ◽  
Vol 75 ◽  
pp. 358-364 ◽  
Author(s):  
Paul K. Romano ◽  
Timothy H. Trumbull
Keyword(s):  
Cross Sections ◽  
Doppler Broadening ◽  
Comparison Of Algorithms

Neutron Up-Scattering Effect in Refined Energy Group Structure

2016 ◽  
Author(s):  
Qingming He ◽  
Hongchun Wu ◽  
Yunzhao Li ◽  
Liangzhi Cao ◽  
Tiejun Zu
Keyword(s):  
Cross Sections ◽  
Group Structure ◽  
Scattering Matrix ◽  
The Self ◽  
Shielding Effect ◽  
Doppler Broadening ◽  
Fuel Temperature ◽  
Energy Group ◽  
Scattering Effect ◽  
Mc Method

Aiming at generating a 361-group library, this paper investigated neutron up-scattering effect in the 361-group Santamarina-Hfaiedh Energy Mesh (SHEM). Firstly, the Doppler Broadening Rejection Correction (DBRC) method is implemented to consider the neutron up-scattering effect in Monte Carlo (MC) method. Then the MC method is employed to prepare resonance integral table and scattering matrix for afterward calculation. Numerical results show that the neutron up-scattering affects kinf by ∼200 pcm at most for UO2 pin cell problems in the 361-group SHEM, while the fuel temperature coefficient (FTC) is also influenced by 12∼13%. It has also been found that both of the above two influences acts through scattering matrix rather than self-shielded absorption cross sections. In addition, the self-shielding effect of cladding is studied and it’s been found that it affects kinf by 30∼70 pcm.

Exact Doppler Broadening of Tabulated Cross Sections

1976 ◽  
Vol 60 (3) ◽  
pp. 199-229 ◽  
Author(s):  
Dermott E. Cullen ◽  
Charles R. Weisbin
Keyword(s):  
Cross Sections ◽  
Doppler Broadening

Effect of Mg Contents on Trapping Efficiency in Al-Mg System Using PAS

2007 ◽  
Vol 265 ◽  
pp. 7-11
Author(s):  
N.A. Kamel
Keyword(s):  
Cross Sections ◽  
Mg Alloys ◽  
Trapping Efficiency ◽  
Thickness Reduction ◽  
Doppler Broadening ◽  
Degree Of Deformation ◽  
S Parameter ◽  
Mean Lifetime ◽  
The Mean ◽  
Al Mg Alloys

PLT and the Doppler broadening S-parameter were used to characterize the Al-Mg alloys, AA5005, AA5051, AA5052 and AA5083. The trapping efficiencies of these alloys were estimated to be 2.42 x 109, 2.29 x 109, 2.24 x 109 and 2.27 x 109 s-1 cm3, respectively, and the corresponding trapping cross-sections were estimated to be 2.66 x 10-16, 2.14 x 10-16, 2.10 x 10-16 and 3.51 x 10-16 cm2. It was found to be very clear that the mean lifetime and S-parameter exhibited the same behaviour as a function of the degree of deformation, and that they saturated at the same degree of thickness reduction.

scholarly journals Study of Doppler broadening Compton scattering and cross section determination for the elements Fe, Zn, Ag, Au and Hg

2019 ◽  
Vol 14 (29) ◽  
pp. 145-157
Author(s):  
Wrood K. Abood
Keyword(s):  
Energy Absorption ◽  
Cross Section ◽  
Photon Energy ◽  
Cross Sections ◽  
Scattered Photon ◽  
Doppler Broadening ◽  
Mass Energy ◽  
Resolution Function ◽  
Electron Momentum ◽  
Momentum Resolution

To assess the contribution of Doppler broadening and examine theCompton profile, the Compton energy absorption cross sections aremeasured and calculated using formulas based on a relativisticimpulse approximation. The Compton energy-absorption crosssections are evaluated for different elements (Fe, Zn, Ag, Au and Hg)and for a photon energy range (1 - 100 keV). With using these crosssections,the Compton component of the mass–energy absorptioncoefficient was derived, where the electron momentum prior to thescattering event caused a Doppler broadening of the Compton line.Also, the momentum resolution function was evaluated in terms ofincident and scattered photon energy and scattering angle. The resultsof cross sections for the coherent and incoherent processes arecompared with theoretical values and reported values of otherresearchers. The present results are in agreement with the theoreticalvalues.

scholarly journals BrO vertical distributions from SCIAMACHY limb measurements: comparison of algorithms and retrieval results

2010 ◽  
Vol 3 (6) ◽  
pp. 5079-5178 ◽  
Author(s):  
A. Rozanov ◽  
S. Kühl ◽  
A. Doicu ◽  
C. McLinden ◽  
J. Puķīte ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Temperature Dependence ◽  
Cross Sections ◽  
Theoretical Basis ◽  
Forward Model ◽  
Solar Light ◽  
Radiative Transfer Models ◽  
Comparison Of Algorithms ◽  
Retrieval Algorithms ◽  
Vertical Distributions

Abstract. This study presents two scientific and one operational retrieval algorithms used to obtain vertical distributions of bromine monoxide (BrO) from observations of the scattered solar light performed by the SCIAMACHY instrument in limb viewing geometry. The study begins with a discussion of the theoretical basis of all algorithms followed by an investigation of the retrieval sensitivity. Simulations with three different radiative transfer models allow us to analyze influence of the forward model implementation upon the retrieval results. By means of synthetic retrievals we analyze major sources of uncertainties in the resulting BrO profiles such as different BrO cross sections, their temperature dependence, and stratospheric aerosols. Finally, the reliability of SCIAMACHY BrO profile retrievals is demonstrated comparing results from different algorithms to balloon-borne observations.

scholarly journals On-the-fly Doppler broadening of unresolved resonance region cross sections

2017 ◽  
Vol 101 ◽  
pp. 444-460 ◽  
Author(s):  
Jonathan A. Walsh ◽  
Benoit Forget ◽  
Kord S. Smith ◽  
Forrest B. Brown
Keyword(s):  
Cross Sections ◽  
Resonance Region ◽  
Doppler Broadening
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