{
 "id": "LIB2-160",
 "entry_version": 12,
 "class": "CLAIM",
 "title": "The fixed-Z isospin coefficient is selected rather than derived",
 "statement": "The isospin Casimir coefficient χ = ϕ⁻⁶T3 is selected on the fixed-Z chains, not derived; the source carries the sector as loaded.",
 "scope": {
  "carrier": "The fixed-Z isospin Casimir term in the nuclear ledger",
  "domain": "The selected coefficient and its declared loaded status.",
  "group": null,
  "hypotheses": [
   "Use the fixed-Z chain selection reported in the source."
  ],
  "physical_target": null,
  "quantifier": "The registered construction and its stated premises.",
  "real_form": null
 },
 "source_labels_as_printed": {
  "math_status": "NOT_PRINTED",
  "attachment": "NOT_PRINTED",
  "scorecard_tier_word": null,
  "pdf_page": 133
 },
 "house_tier": null,
 "review_state": "PUBLISHED",
 "scientific_status": "UNDER_REVIEW (house status not yet adjudicated)",
 "evidence_status": [
  {
   "kind": "computational",
   "availability": "unknown"
  }
 ],
 "primary_source": {
  "component": "Paper 9",
  "section": "§9, Isospin coefficient",
  "pdf_page": 138,
  "quote": "The isospin Casimir coefficient χ = φ−6 T3 is selected on the fixed-Z chains, not derived."
 },
 "caution": "The selected coefficient is not a derived isospin magnitude law or a prediction of the neutron–proton mass difference.",
 "candidate_ids": [
  "C2-129"
 ],
 "basis": {
  "pdf_sha256_prefix": "b64ddcd9e16a6dcd",
  "release": "Rev33.1_S369"
 },
 "relationships": [
  {
   "type": "related_to",
   "target": "LIB2-155"
  }
 ],
 "url": "/library-v2/LIB2-160/",
 "content_sha256": "0c7fdf9ef60393342eb1f1be32b2cfc74ef451732f6ff46b82e32bb835b6bfbf",
 "build_stamp": "BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02"
}