PDF) The Multi-Group Neutron Diffusion Equation in General Geometries Using the Parseval Identity
SOLVED: 15.4.4 For a point source at the origin, the three-dimensional neutron diffusion equation becomes -D∇^2ψ(r)+Kψ(r)=Qδ(r). Apply a three-dimensional Fourier transform. Solve the transformed equation. Transform the solution back into r-space ...