{
  "annotation_id": "8f1d3976-ea7d-490d-a359-e33baa4f4577",
  "date_created": "2026-03-02T18:00:25.080000Z",
  "date_modified": "2026-03-02T18:00:25.080000Z",
  "file_hash": "a2da647558d0ed729a898d8714ff22bd9833679b08de1856633299c8753b5c71",
  "private": false,
  "record": {
    "abstract": "A measurement of the 56Ni cosmic ray abundance has been discussed as a\npossible tool to determine the acceleration time scale of relativistic\nparticles in cosmic rays. This conjecture will depend on the halflife of\ntotally ionized 56Ni which can only decay by higher-order forbidden\ntransitions. We have calculated this halflife within large-scale shell model\ncalculations and find t_{1/2} \\approx 4 \\times 10^4 years, only slightly larger\nthan the currently available experimental lower limit, but too short for 56Ni\nto serve as a cosmic ray chronometer.",
    "arxiv_id": "nucl-th/9902005",
    "authors": [
      "J. Lund Fisker",
      "G. Martinez-Pinedo",
      "K. Langanke"
    ],
    "categories": [
      "nucl-th",
      "astro-ph"
    ],
    "journal_ref": "Eur.Phys.J. A5 (1999) 229-231",
    "title": "Halflife of 56Ni in cosmic rays",
    "url": "https://arxiv.org/abs/nucl-th/9902005"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "db8fb3c4-0406-43bd-aabc-1235aee9680e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}