{
  "annotation_id": "f40b2c2f-8814-40a1-9c85-00039e9ff02a",
  "date_created": "2026-03-02T18:00:15.244000Z",
  "date_modified": "2026-03-02T18:00:15.244000Z",
  "file_hash": "349a0237731bb0ce544cc3307056b1c28e58be74f371c7d437b9b2dfdd2f0fac",
  "private": false,
  "record": {
    "abstract": "Sum rules for $B(M1,0^+_1\\rightarrow1^+_i)$ strength are derived for\neven-even nuclei in the isospin-invariant forms of the IBM, IBM-3 and IBM-4, in\nthe cases where the respective natural internal symmetries, isospin $U$(3) and\n$U(6)\\supset SU$(4), are conserved. Subsequently, the total strength is\nresolved into its component partial sums to the allowed isospins (and $SU(4)$\nrepresentations in IBM-4). In cases where the usual IBM dynamical symmetries\nare also valid, a complete description of all $B(M1,0^+_1\\rightarrow1^+_i)$ is\ngiven. In contrast to IBM-2, there is fragmentation of the strength even in the\ndynamical symmetry cases, for $T\\neq 0$, over two states in IBM-3, and over\nthree states in IBM-4. The presence of $pn$ bosons in the ground state of the\nextended versions reduces the expected strength from that for IBM-2, allowing\nin principle the possibility of using $B(M1)$ data for a given nucleus to infer\nwhich version is the most appropriate.",
    "arxiv_id": "nucl-th/9508012",
    "authors": [
      "P. Halse",
      "P. Van Isacker",
      "B. R. Barrett"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/0370-2693(95)01213-A",
    "journal_ref": "Phys.Lett. B363 (1995) 145-150",
    "title": "Sum Rules for B(M1,0+ -\u003e 1+) Strength in IBM-3 and IBM-4",
    "url": "https://arxiv.org/abs/nucl-th/9508012"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "df6176ed-2394-4862-b757-a11cd9c62a36",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}