Scale invariance ofgA/gVin quark-confining potentials

It is demonstrated that the spin distribution in the nucleon surface determines the value of $g_A$/$g_V$. This ratio is shown to be scale invariant; it is sensitive to the surface thickness and to the type of quark confinement (Dirac-scalar or -vector) and vanishes for pure vector confinement. A phase transition is found from confinement to deconfinement when the ratio of vector to scalar confinement falls below a critical value (-1.0). Experiments to probe a Dirac-vector component in the (free or bound) nucleon are proposed in the light of the CPT theorem.