{
  "annotation_id": "f9d52229-b3a6-4fe1-ab4b-0b47f332be60",
  "date_created": "2026-03-02T18:00:53.856000Z",
  "date_modified": "2026-03-02T18:00:53.856000Z",
  "file_hash": "d6fc78716c5275fbb1e3e0515963a75da6e56edd3554a2e0b0ed046b8b127ad8",
  "private": false,
  "record": {
    "abstract": "We describe a new aerogel threshold Cherenkov detector installed in the HMS\nspectrometer in Hall C at Jefferson Lab. The Hall C experimental program in\n2003 required an improved particle identification system for better\nidentification of pi/K/P, which was achieved by installing an additional\nthreshold Cherenkov counter. Two types of aerogel with n=1.03 and n=1.015 allow\none to reach 10^{-3} proton and 10^{-2} kaon rejection in the 1-5 GeV/c\nmomentum range with pion detection efficiency better than 99% (97%). The\ndetector response shows no significant position dependence due to a diffuse\nlight collection technique. The diffusion box was equipped with 16 Photonis\nXP4572 PMT\u0027s. The mean number of photoelectrons in saturation was ~16 and ~8,\nrespectively. Moderate particle identification is feasible near threshold.",
    "arxiv_id": "physics/0411147",
    "authors": [
      "R. Asaturyan",
      "R. Ent",
      "H. Fenker",
      "D. Gaskell",
      "G. M. Huber",
      "M. Jones",
      "D. Mack",
      "H. Mkrtchyan",
      "B. Metzger",
      "N. Novikoff",
      "V. Tadevosyan",
      "W. Vulcan",
      "S. Wood"
    ],
    "categories": [
      "physics.ins-det"
    ],
    "doi": "10.1016/j.nima.2005.04.058",
    "journal_ref": "Nucl.Instrum.Meth. A548 (2005) 364-374",
    "title": "The aerogel threshold Cherenkov detector for the High Momentum   Spectrometer in Hall C at Jefferson Lab",
    "url": "https://arxiv.org/abs/physics/0411147"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "18c6ecfc-bb4f-4a02-a795-c99a12a57850",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}