Treatment of scattering anisotropy of neutrons through the Boltzmann-Fokker-Planck equation

Journal Article · Tue Feb 01 04:00:00 EST 1983 · Nucl. Sci. Eng.; (United States)

OSTI ID:5230505

Caro, M; Ligou, J

Handling the highly anisotropic scattering of fast neutrons with conventional methods usually means that high-order Legendre expansions can be necessary to obtain correct angular fluxes. This drawback in standard transport calculations is avoided by applying the Boltzmann-Fokker-Planck (BFP) method, already used in transport of charged particles, to neutrons. Two methods are described to obtain the relevant input data for the one-dimensional BFP-1 code, one using basic differential scattering cross sections and the other using existing standard multigroup libraries. Numerical results for both methods are produced, revealing BFP as a powerful method when solving transport problems dealing with very fast neutrons. It is found that high accuracy, even for extreme cases of anisotropy, is achieved without increase of the computational effort.

• Research Organization: Institut de Genie Atomique, Ecole Polytechnique Federale de Lausanne EPFL-Ecublens, CH-1015 Lausanne
• OSTI ID: 5230505
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 83:2; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

654003* -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
ANISOTROPY
BARYONS
BOLTZMANN EQUATION
CHARGED-PARTICLE TRANSPORT
COHERENT SCATTERING
COMPUTER CODES
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DIFFRACTION
ELEMENTARY PARTICLES
EQUATIONS
FAST NEUTRONS
FERMIONS
FOKKER-PLANCK EQUATION
FUNCTIONS
HADRONS
LEGENDRE POLYNOMIALS
NEUTRON DIFFRACTION
NEUTRON TRANSPORT THEORY
NEUTRONS
NUCLEONS
PARTIAL DIFFERENTIAL EQUATIONS
POLYNOMIALS
RADIATION TRANSPORT
SCATTERING
TRANSPORT THEORY