CNG D–T Observer Geometry and Titanium Closure: Exact Observer-Width Transfer and Theoretical Closure of the Fourteen-Cell hcp Titanium Reactor Switch

This paper unifies two previously open parts of the Constrained Null Geometry description of deuterium–tritium fusion. First, it distinguishes the intrinsic finite D–T event from the external event produced by an experimental measurement apparatus. An exact observer-transfer model shows how reconstruction, energy mapping, acceptance, resolution, and noise can shift the measured resonance width away from the intrinsic event width. Applied to published D–T data, the model quantifies the observed 0.1197 percent difference and identifies which classes of measurement geometry can produce it. Second, the paper closes the theoretical material geometry of the proposed titanium reactor within the canonical hcp alpha-titanium single-vacancy response sector. The complete carrier consists of eight tetrahedral and six octahedral cells. Its fourteen-cell geometry yields the unique collective symmetry pair, the exact D–T pull-through, the positive admissible direction, the coefficient one third, and the first exterior opposite-sign continuation. The result proves the titanium reactor switch theoretically for the declared material sector. Experimental identification of that sector in a fabricated titanium specimen remains a separate laboratory task. No force law, Coulomb barrier, potential, Gamow factor, or conventional scattering trajectory is used as an intrinsic premise.