Afwl-atac joint shielding program. Investigation of analytical methods, solution sensitivity, and structural scattering in neutron transport. Technical report, 1 October 1964-30 September 1965

Technical Report · Tue Mar 01 04:00:00 EST 1966

OSTI ID:5382058

Norwood, J M; Jones, E E; Goodwin, D A; Kleinjan, P L

A limited investigation was made of the effect of cross-section measurement error and of cross-section approximation upon the transport-equation solution at deep penetration. The most-serious error in deep penetration calculations appears to arise from inadequate treatment of anisotropic scattering; a P1 scattering kernel is not adequate. Other aspects of the problem are included in the study. It is recommended that calculations be made to deep penetration with transport codes capable of handling anisotropic scattering. An analytical approach to the solution of the multigroup formulation of the transport equation was studied, and the method yields the correct functional form of the vector flux in terms of the penetration distance and neutron directions of motion. Complete solution requires the inversion of large matrices. A method of inclusion of theta dependence in the multigroup transport equation applicable to slab geometry was investigated. The method should be practical for crew-compartment shielding calculations. The scattering of fast neutrons from structures was subjected to a limited investigation by means of Monte Carlo methods, and approximate analytical formulas applicable to materials with strongly peaked forward scattering were derived.

• Research Organization: General Dynamics Corp., Fort Worth, TX (USA)
• OSTI ID: 5382058
• Report Number(s): AD-480699/8/XAB; FZK-262
• Country of Publication: United States
• Language: English

Related Subjects

654002* -- Radiation & Shielding Physics-- Shielding Calculations & Experiments-- (-1987)
654003 -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
BARYONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
FAST NEUTRONS
FERMIONS
HADRONS
HYDRIDES
HYDROGEN COMPOUNDS
IRON
LITHIUM COMPOUNDS
METALS
MONTE CARLO METHOD
NEUTRON FLUX
NEUTRON TRANSPORT THEORY
NEUTRONS
NUCLEONS
RADIATION FLUX
RADIATIONS
SHIELDING
SHIELDS
THERMAL NEUTRONS
THERMAL RADIATION
TRANSITION ELEMENTS
TRANSPORT THEORY