  In this paper, we use Yukawa theory to calculate differential and total
cross-sections for elastic and inelastic scattering in nucleon-nucleon
interactions. We start from the fundamental Lagrangian and derive the
$T$-matrix and hence the invariant scattering matrix leading towards the
differential and total cross section. We perform calculations utilizing two
types of Yukawa interaction terms: 1) scalar current, and 2) pseudoscalar
current. We also carry out calculations in a laboratory frame. Calculated
results using scalar current exhibits the exact features of elastic and
inelastic scattering. The results agree very well with the differential
cross-sections for experimental data. The pseudoscalar current calculations do
not offer reasonable results and features of the NN interactions. The
simplicity of the theory makes it all the more impressive, thus it can be used
in place of more complicated field theories to describe NN interactions.
