{
  "annotation_id": "8f55d473-475b-4cf6-b26c-c38e4a5fcaed",
  "date_created": "2026-03-02T18:00:42.677000Z",
  "date_modified": "2026-03-02T18:00:42.677000Z",
  "file_hash": "ddd2f38e82224f3176da14435c86c103586c52a785a278289131f6823a79f7e7",
  "private": false,
  "record": {
    "abstract": "Over five years we have compared the hyperfine frequencies of 133Cs and 87Rb\natoms in their electronic ground state using several laser cooled 133Cs and\n87Rb atomic fountains with an accuracy of ~10^{-15}. These measurements set a\nstringent upper bound to a possible fractional time variation of the ratio\nbetween the two frequencies : (d/dt)ln(nu_Rb/nu_Cs)=(0.2 +/- 7.0)*10^{-16}\nyr^{-1} (1 sigma uncertainty). The same limit applies to a possible variation\nof the quantity (mu_Rb/mu_Cs)*alpha^{-0.44}, which involves the ratio of\nnuclear magnetic moments and the fine structure constant.",
    "arxiv_id": "physics/0212112",
    "authors": [
      "H. Marion",
      "F. Pereira Dos Santos",
      "M. Abgrall",
      "S. Zhang",
      "Y. Sortais",
      "S. Bize",
      "I. Maksimovic",
      "D. Calonico",
      "J. Gruenert",
      "C. Mandache",
      "P. Lemonde",
      "G. Santarelli",
      "Ph. Laurent",
      "A. Clairon",
      "C. Salomon"
    ],
    "categories": [
      "physics.atom-ph",
      "astro-ph",
      "gr-qc",
      "hep-ex",
      "hep-ph"
    ],
    "doi": "10.1103/PhysRevLett.90.150801",
    "journal_ref": "Phys.Rev.Lett. 90 (2003) 150801",
    "title": "A Search for Variations of Fundamental Constants using Atomic Fountain   Clocks",
    "url": "https://arxiv.org/abs/physics/0212112"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3fb59c95-222d-467b-89bd-f97af66b3bba",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}