Draft: Krane SEMF coefficients + Z/N quark decomposition (N2, reconciliation pending)#14
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… (tests pending) Implementation (complete): - gpu_stack/presets/nuclear.py: Krane Table 3.2 semi-empirical mass formula coefficients as a sourced calibration preset factory with the pairing-term convention (A^(-1/2) exponent) and reference-energy semantics documented against this model's symbolic structure. - Quark-count decomposition across source and medium components using the quark-model identities U = 2Z + N and D = Z + 2N (PDG-referenced), turning primitive valence quark-count roots into derived equations. - Redundant triplet-integrality equations removed where the sum identity U + D = 3A is now implied by the Z/N identities. Status (honest): the structural reconciliation of the test suite is NOT finished. 54 tests across ~20 files still assert the old root structure (trace shapes, removed equation names, old root counts), dominated by tests/test_materials_calibrated_presets.py and the lithography source/species/medium boundary packs. Last observed run: 54 failed, 643 passed. The implementation imports cleanly and the resolved values are correct where probed (source_neutron_count resolves to 70 with no missing inputs). This commit preserves the interrupted agent's work for a follow-up reconciliation pass. https://claude.ai/code/session_01Eu2JVnPFgMQftwYTP3cGQZ
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N2 of 10: SEMF coefficients + quark-count decomposition — DRAFT, test reconciliation pending
Implementation (complete)
gpu_stack/presets/nuclear.py. The standing blocker (source, SI conversion, pairing/reference-energy semantics) is addressed: the pairing-termA^(-1/2)convention and the meaning ofnuclear_pairing_gap_reference_energyare verified against this model's symbolic structure and documented in the preset.U = 2Z + N,D = Z + 2N(PDG-referenced), turning the heaviest root-debt family's primitives (12+ quark-count roots at ~218 weight each) into derived values.U + D = 3Ais now implied.Why draft
The agent hit the session usage limit mid-reconciliation. 54 tests across ~20 files still assert the old structure (trace shapes, removed equation names, old root counts) — dominated by
tests/test_materials_calibrated_presets.py(10), lithography source/species boundary packs (9), and CLI/root-debt snapshots. Last observed:54 failed, 643 passed. Probed values are correct (e.g.source_neutron_countresolves to 70, missing=0); the failures are stale expectations, not wrong physics — but each deserves deliberate review rather than bulk-bumping.Remaining work
root-debt --families --limit 5) and update count assertions (619 will drop).https://claude.ai/code/session_01Eu2JVnPFgMQftwYTP3cGQZ
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