Macroscopic cross section from mean free path

Macroscopic cross section is the inverse of mean free path of neutrons. As an example, the greater the absorption cross section of a material is, the shorter the mean free path of neutrons is and the closer to the surface the neutron absorption will occur.

Links:

  1. NuclearPower, section “Mean Free Path”.

mean_free_path

mean_free_path of neutrons.

Symbol:

lambda

Latex:

\(\lambda\)

Dimension:

length

macroscopic_cross_section

macroscopic_cross_section.

Symbol:

Sigma

Latex:

\(\Sigma\)

Dimension:

1/length

law

Sigma = 1 / lambda

Latex:
\[\Sigma = \frac{1}{\lambda}\]