{
  "annotation_id": "ab02d927-205b-4736-92f5-9c5557930a47",
  "date_created": "2026-03-02T18:00:11.067000Z",
  "date_modified": "2026-03-02T18:00:11.067000Z",
  "file_hash": "0ff839483843b2291fbb24aef7f74085f1bafb16c57d20a07b7f42eac5112770",
  "private": false,
  "record": {
    "abstract": "Calculations are presented for four relatively strong first-forbidden $\\beta$\ndecays in the region A=11-16 in order to study the very large\nmesonic-exchange-current enhancement of the rank-zero components. The $\\mu^-$\ncapture on $^{16}$O is considered on the same footing. The wave functions\nutilized include up to 4$\\hbar\\omega$ excitations. Two-body exchange-current\nmatrix elements are calculated as well as one-body impulse approximation matrix\nelements. The resultant enhancement factor that multiplies the\nimpulse-approximation axial-charge matrix element is thereby determined by\ncomparison to experiment to be $\\epsilon_{exp}$ = 1.61 $\\pm$ 0.03 from three\n$\\beta^-$ decays and $\\mu^-$ capture on $^{16}$O, which is in excellent\nagreement with meson-exchange calculations in the soft-pion approximation.",
    "arxiv_id": "nucl-th/9309014",
    "authors": [
      "E. K. Warburton",
      "I. S. Towner",
      "B. A. Brown"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.49.824",
    "journal_ref": "Phys.Rev.C49:824-839,1994",
    "title": "First-Forbidden beta decay: Medium enhancement of the axial charge at   A=16",
    "url": "https://arxiv.org/abs/nucl-th/9309014"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e19be3e1-66bd-4361-a71b-71b519622ed5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}