This upgraded version of msf: 49700 refines the USP Field Theory interpretation of the neutron as a confined dark-surface resonance cluster: a compact nuclear-scale oscillatory structure whose outward-accessible resonance corridors cancel to first order while its internal oscillatory coherence remains active. The word “dark” is used here only in the local surface-coupling sense. It does not mean that ordinary neutrons are cosmological dark matter. Instead, the neutron is treated as a local nuclear analogue of surface-corridor cancellation: internally structured, magnetically and weakly accessible, but electromagnetically suppressed through destructive boundary-vector cancellation. Version 1. 5 strengthens the paper by introducing explicit operational quantities and guardrails. It defines the electromagnetic suppression factor SEM, clarifies the active-cancellation condition behind neutron neutrality, distinguishes neutron surface cancellation from anti-neutron boundary inversion, and rejects the shortcut tauₙ ≈ 1 / Delta fconf. The neutron lifetime is instead treated through a calibrated weak-reopening or residual-rate framework. The document also introduces a clearer relationship between the locking index etaₗock and the coherence-lock metric kappaₗock, adds a Monte Carlo boundary-corridor simulation track, and updates the simulation cost function to use the periodic phase term 1 - cos (thetaⱼ - thetaₖ), avoiding artifacts near the 2pi phase boundary. This work does not replace QCD, electroweak theory, neutron lifetime measurements, nuclear shell models, lattice QCD, or Standard Model beta-decay phenomenology. It provides a compatibility-first geometric interpretation layer that can be constrained or disfavored by neutron lifetime residuals, neutron scattering data, isotope-controlled residuals, and reproducible simulation tests.
Sadegh Sepehri (Fri,) studied this question.