Unified Phase-Geometric Theory (UPGT): Low Energy Nuclear Reactions

The work develops a minimal two-channel framework in which rare, defect-assisted channel mixing into a multipole-neutral branch provides a threshold-like entrance pathway, while rapid medium-assisted relaxation suppresses hard radiative channels.The model is self-consistent at the level of orders of magnitude and is intended as a theoretical reference for further analysis and experimental tests. it is based on Foundations (DOI: https://doi.org/10.5281/zenodo.17334970) and Atom (DOI: https://doi.org/10.5281/zenodo.17369516)