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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 ...


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 ...


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 ...


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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