{
  "annotation_id": "48cec454-dd12-48dc-9e4e-7595a4820a92",
  "date_created": "2026-03-02T18:00:35.923000Z",
  "date_modified": "2026-03-02T18:00:35.923000Z",
  "file_hash": "0af9749c2aa1938e5c49b44412404b5cf65f1acdea520eb4f6404693ceecdd2a",
  "private": false,
  "record": {
    "abstract": "Exploiting an approach similar to the R-matrix theory, the diffusion Monte\nCarlo method is employed to compute phase shifts and threshold cross sections\nfor the elastic scattering of o-positronium off light atoms. Results are\nobtained for Ps-H and Ps-He as representative cases of open and closed shell\ntargets. The method allows for an exact treatment of both correlation and\nexchange interactions, and represents the most promising approach to deal with\nthese effects in more complicated targets. In particular the Ps-He threshold\ncross section, computed in a many body framework for the first time, represents\na standard by which past and future numerical and experimental estimates can be\njudged.",
    "arxiv_id": "physics/0111175",
    "authors": [
      "Simone Chiesa",
      "Massimo Mella",
      "Gabriele Morosi"
    ],
    "categories": [
      "physics.atom-ph",
      "physics.comp-ph"
    ],
    "doi": "10.1103/PhysRevA.66.042502",
    "title": "o-Positronium scattering off H and He",
    "url": "https://arxiv.org/abs/physics/0111175"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "449d28e8-6cf7-424f-8544-eabe2c5b2480",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}