Paper CCLXII: Bulk Excursion Action and G₂ Floquet Resonance — A Sub-Barrier Fusion Enhancement Mechanism for Heavy Nuclei

Distinguishes brane collapse (globally forbidden by S⁷ topology) from bulk excursion (single-worldline detour through 5D, topologically permitted). The bulk excursion action Sₑxc = −ℏ ln fbulk = 3. 30ℏ at the G₂ Floquet resonance (fbulk = 3. 691%, Paper CCIV), compared to the Gamow action SGamow = 2πηℏ >> 60ℏ for heavy nuclei at sub-barrier energies. The G₂ Floquet resonance of Paper CCXXIV (t'/t = 1/√3, T₁/T₂ = √3, anomalous winding WB = 2) identifies the drive as the pion-exchange oscillation between approaching nuclei at kinetic energy tuned to the G₂ ratio condition. At resonance, the H⁺/H⁻ sublattice pair (A/B-sublattice correlation of CCXXIV) executes a correlated collective bulk excursion at probability fbulk (not fbulk²) ; the Coulomb barrier is absent in 5D; the strong nuclear force (bulk-threading, Papers CXX/CXLII) fuses the pair during transit. Enhancement ratio fbulk/TGamow: D+D at 100 keV = 0. 84 (useless) ; D+T at 100 keV = 1. 14 (marginal) ; C12+C12 at 2 MeV = 10²5; Si28+Si28 at 20 MeV = 10⁶9. Geometric coupling Ggeom = (ℓC/r) ³ with ℓC = 6. 85 fm limits standalone cold fusion (Ggeom ~ 10^-14 at room temperature). Muon-catalysis hybrid: μ-Si28 (r_μ = 18 fm, Ggeom = 5. 5%) gives Pfus = 0. 21% per cycle with Q = +11. 4 MeV per fusion — the viable cold-fusion route. Four predictions: CCLXII-P1 (beam-on/beam-off enhancement >= 10¹5 for C12+C12 at Ecm = 2 MeV, testable now at TRIUMF/GANIL/iThemba), CCLXII-P2 (sharp resonance profile peaked at 28. 8 MeV/u), CCLXII-P3 (stellar C-burning S-factor floor at 3. 691% × σGamow), CCLXII-P4 (μ-Si catalysis rate 0. 21% per encounter). Clinical link: same G₂ Floquet drive enhances Mo-100 → Tc-99m conversion (Paper XLVII saddle tunneling), reducing reactor-neutron dependence in medical isotope production. Framework count: 263 numbered papers. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10. 5281/zenodo. 19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M. D. , University of Minnesota. ORCID: 0000-0002-1143-941X.