  In this paper we fix our attention, on hadron structure, and show that also
the strong interaction strength alpha_S, ordinarily called the "(perturbative)
coupling--constant square}", can be evaluated within our theory, and found to
decrease (increase) as the "distance" r decreases (increases). This yields both
the confinement of the hadron constituents, and their asymptotic freedom: in
qualitative agreement with the experimental evidence. In other terms, our
approach leads us, on a purely theoretical ground, to a dependence of alpha_S
on r which had been previously found only on phenomenological and heuristic
grounds. We expect the above agreement to be also quantitative, on the basis of
a few checks performed in this work.
