However, it is possible to define the macroscopic cross section " ? " which corresponds to the total equivalent area of all target particles per unit volume:
2.
Therefore, since the cross section can be expressed in cm 2 and the density in cm " 3, the macroscopic cross section is usually expressed in cm " 1.
3.
Using equation derived in # Link to reaction rate and interpretation, the reaction rate per unit volume " R " can be derived using only the neutron flux " ? " and the macroscopic cross section " ? ":
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