{
  "annotation_id": "660b7902-b48b-4373-8190-d5ecefca123b",
  "date_created": "2026-03-02T18:01:17.751000Z",
  "date_modified": "2026-03-02T18:01:17.751000Z",
  "file_hash": "b284d6cbca9e6817d97a20169cea66f47dae757b3b7da9273f1052ef12551f82",
  "private": false,
  "record": {
    "abstract": "We present a first experimental demonstration of a new method to extract a\nwell-collimated beam of ultra-cold neutrons (UCN) from a storage vessel.\nNeutrons with too large divergence are not removed from the beam by an\nabsorbing collimation, but a diffuse or semidiffuse channel with high Fermi\npotential reflects them back into the vessel. This avoids unnecessary losses\nand keeps the storage time high, which may be beneficial when the vessel is\npart of a UCN source with long buildup time of a high UCN density.",
    "arxiv_id": "physics/0703079",
    "authors": [
      "P. Schmidt-Wellenburg",
      "J. Barnard",
      "P. Geltenbort",
      "V. V. Nesvizhevsky",
      "C. Plonka",
      "T. Soldner",
      "O. Zimmer"
    ],
    "categories": [
      "physics.ins-det"
    ],
    "doi": "10.1016/j.nima.2007.03.032",
    "title": "Efficient extraction of a collimated ultra-cold neutron beam using   diffusive channels",
    "url": "https://arxiv.org/abs/physics/0703079"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1c5bc89b-19c5-4627-a459-447df5d83885",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}