{
  "annotation_id": "d0ef606d-37a5-4a39-9a14-5b5565d9105f",
  "date_created": "2026-03-02T18:00:53.369000Z",
  "date_modified": "2026-03-02T18:00:53.369000Z",
  "file_hash": "04ea2e3b444479760bba1cde63461fd782921d9499d269433d12b2a9a9eb3e54",
  "private": false,
  "record": {
    "abstract": "The HERMES hydrogen and deuterium nuclear-polarized gas targets have been in\nuse since 1996 with the polarized electron beam of HERA at DESY to study the\nspin structure of the nucleon. Polarized atoms from a Stern-Gerlach Atomic Beam\nSource are injected into a storage cell internal to the HERA electron ring.\nAtoms diffusing from the center of the storage cell into a side tube are\nanalyzed to determine the atomic fraction and the atomic polarizations. The\natoms have a nuclear polarization, the axis of which is defined by an external\nmagnetic holding field. The holding field was longitudinal during 1996-2000,\nand was changed to transverse in 2001. The design of the target is described,\nthe method for analyzing the target polarization is outlined, and the\nperformance of the target in the various running periods is presented.",
    "arxiv_id": "physics/0408137",
    "authors": [
      "The HERMES Collaboration"
    ],
    "categories": [
      "physics.ins-det",
      "physics.atom-ph"
    ],
    "doi": "10.1016/j.nima.2004.11.020",
    "journal_ref": "Nucl.Instrum.Meth.A540:68-101,2005",
    "title": "The HERMES Polarized Hydrogen and Deuterium Gas Target in the HERA   Electron Storage Ring",
    "url": "https://arxiv.org/abs/physics/0408137"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dc19d6f9-e453-4fcb-a14b-b7b6e988f237",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}