{
  "annotation_id": "b0528028-5d05-44e3-94e9-2378afc9d6c5",
  "date_created": "2026-03-02T18:01:25.441000Z",
  "date_modified": "2026-03-02T18:01:25.441000Z",
  "file_hash": "a7855e4c564af53150997cbafc668ef6014c7c52f9d90d140ed62c98443941e8",
  "private": false,
  "record": {
    "abstract": "The formulation of a suitable nonlocal model potential for electron exchange\nis presented, checked with electron-hydrogen and electron-helium scattering,\nand applied to the study of elastic and inelastic scattering and ionization of\northo positronium (Ps) by helium. The elastic scattering and the $n = 2$\nexcitations of Ps are investigated using a three-Ps-state close-coupling\napproximation. The higher ($n\\ge 3$) excitations and ionization of Ps atom are\ntreated in the framework of Born approximation with present exchange.\nCalculations are reported of phase shifts, and elastic, Ps-excitation, and\ntotal cross sections. The present target elastic total cross section agrees\nwell with experimental results at thermal to medium energies.",
    "arxiv_id": "physics/9911052",
    "authors": [
      "P. K. Biswas",
      "Sadhan K. Adhikari"
    ],
    "categories": [
      "physics.atm-clus",
      "cond-mat",
      "nucl-th",
      "physics.atom-ph",
      "physics.chem-ph",
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.59.363",
    "journal_ref": "Phys.Rev. A59 (1999) 363-370",
    "title": "Electron exchange model potential: Application to positronium-helium   scattering",
    "url": "https://arxiv.org/abs/physics/9911052"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "133eb559-60c8-4e81-8edd-69395cb90ae5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}