{
  "annotation_id": "5e457aeb-85e5-4f0e-a06a-aa72cf911f85",
  "date_created": "2026-03-02T18:00:46.791000Z",
  "date_modified": "2026-03-02T18:00:46.791000Z",
  "file_hash": "7fcc7d2d91f7b586c0e2f981bcc53ffd5780c335665f990173d8890a4ea0b949",
  "private": false,
  "record": {
    "abstract": "Light concentrators for the solar neutrino experiment Borexino and the\nCounting Test Facility (CTF) have been developed and constructed. They increase\nthe light yield of these detectors by a factor of 2.5 and 8.8, respectively.\nTechnical challenges like long term stability in various media, high\nreflectivity and radiopurity have been addressed and the concepts to overcome\nthese difficulties will be described. Gamma spectroscopy measurements of the\nconcentrators show an upper limit of 12e-6 Bq/g for uranium and a value of\n120e-6 Bq/g for thorium. Upper limits on other possible contaminations like\n26Al are presented. The impact of these results on the performance of Borexino\nand the CTF are discussed and it is shown that the design goals of both\nexperiments are fulfilled.",
    "arxiv_id": "physics/0310076",
    "authors": [
      "L. Oberauer",
      "C. Grieb",
      "F. von Feilitzsch",
      "I. Manno"
    ],
    "categories": [
      "physics.ins-det"
    ],
    "doi": "10.1016/j.nima.2004.05.095",
    "journal_ref": "Nucl.Instrum.Meth. A530 (2004) 453-462",
    "title": "Light Concentrators for Borexino and CTF",
    "url": "https://arxiv.org/abs/physics/0310076"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d4977f11-743f-4930-85bf-eb3d43b9bb42",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}