  In this paper we consider torsion gravity in the case of the Dirac field, and
by going into the rest frame we study what happens when a uniform precession as
well as a phase are taken into account for the spinor field; we discuss how
partially conserved axial-vector currents and torsion-spin attractive
potentials justify negative Takabayashi angle and energy smaller than mass:
because in this instance the module goes to zero exponentially fast then we
obtain stable and localized matter distributions suitable to be regarded as a
description of particles.
