BIG-B9 Fission-Like Metastability Dataset: Open-Boundary Verification of a Minimal Boundary-Energy Model

This dataset provides the numerical outputs, figures, and metadata for the BIG-B9 minimal boundary-energy model for fission-like metastability in Boundary Information Geometry. The model studies the energy E(Ω; λ) = σP(Ω) + λC(Ω), where P(Ω) is a boundary-length cost and C(Ω) is a regularized Coulomb-like nonlocal repulsive energy. This package includes Cassini-branch data, separated two-disk branch data, analytic perimeter correction results, and the B9.5 open-boundary verification. The open-boundary computation uses zero-padded convolution to test whether the far-separated two-disk threshold is a periodic-boundary artifact. Main results included in this package: - Near-scission Cassini threshold: λ_near ≈ 55.9- Open-boundary finite-scan two-disk threshold: λ_scan^open,exactP ≈ 48.064- Open-boundary self-asymptotic estimate: λ_inf,self^open,exactP ≈ 41.996- Open-boundary linear tail estimate: λ_inf,lin^open,exactP ≈ 42.006- Open-boundary quadratic tail estimate: λ_inf,quad^open,exactP ≈ 43.988 The safest interpretation is λ_inf ≈ 42.0, with a conservative range λ_inf ≈ 42–44. This dataset does not claim to provide a quantitative model of nuclear fission. It supports a minimal geometric result: boundary cost and nonlocal repulsion alone can generate a fission-like metastable energy landscape.