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I thought a cross-section would be $cm^2$, not $cm^{-2}$. The information you really lack is probably the macroscopic cross section. That is, $\Sigma = n \sigma$, where n is the number density of the target objects, in number per cubic centimeter. Thus, this gives a value of inverse length units. Using this, you can readily speak in terms of the ...

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Part of your confusion here probably comes from your notation. Usually we reserve the index $\mu$ for spacetime. The generators of $SU(N)$ are more commonly labelled with Latin indices $t^a$. See for example here. We can split the amplitude into two parts, according to whether they concern color or kinematics. You are just interested in the color part. Each ...

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Neutron-matter interaction cross-sections vary somewhat depending on the material in question, and depends greatly on energy. In addition, the type of neutron-matter interaction that statistically dominates depends on the energy, with elastic collision being the sole contributor to material cross-sections below energies of 4 MeV: If you're talking about ...

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Either the Nijmegen or Argonne v18 potentials are "realistic," meaning that they fit the two-body (pp,np) scattering data up to 350 MeV lab with $\chi^2$ per datum ~ 1. Using their names you can search online and the literature.

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