I am really confused about the difference between flux and scalar flux. I have a specific question:
If we have a parallel neutron beam of strength $\phi_0$ given in neutrons/cm$^2$s, incident on a finite slab of thickness $L$, consisting of a purely absorbing material with cross section $\Sigma_a (x)$ and the neutrons only travel from left to right in the slab, how do I find the scalar flux? Do I merely divide $\phi_0/\Sigma_a$? That would give me a result in neutrons per second, right? I think this might have to do something with the neutron attenuation, but can't seem to get on the right track with this problem.