How strong nuclear force become repulsive at distance less than 0.7fm? What is its mechanism?

Question

I read many times that strong force become repulsive at distance less than (0.7×10^-15 m) but no-one explains how? and what is its carrier particle? what is its mechanism? I searched for answers so hard but didn't find. And please don't say pauli exclusion principal because it is clearly said in Wikipedia that "principle which states that two or more identical fermions (particles with half-integer spin) cannot occupy the same quantum state within a quantum system simultaneously." And "Particles with an integer spin, or bosons, are not subject to the Pauli exclusion principle" so answer transformation of attractive nature of strong force to repulsive. repulsive.

Answer 1

The gauge boson (or "carrier particle") of the strong interaction is the gluon, see https://en.wikipedia.org/wiki/Gluon

As for the coupling strengths at different interaction energies (i.e. length scales), you might find this article helpful, in particular the sections about asymptotic freedom and scaling: https://www.pnas.org/content/102/26/9099