\[\phi(E, x, y, z, \theta, \omega, T)\]
\[\sigma(x, i, E, T)\]
\[\sigma(x, i, E, T)=\] nuclear structure + experiments
Export control is serious.
Hundreds of discrete facilities mine, mill, convert, fabricate, transmute, recycle, and store nuclear material.
A facility might create material.
It might request material.
It might do both.
Even simple fuel cycles have many independent agents.