{
  "annotation_id": "19ef2075-ea79-4734-aaba-09e637a26d8a",
  "date_created": "2026-03-02T18:00:14.759000Z",
  "date_modified": "2026-03-02T18:00:14.759000Z",
  "file_hash": "fdf6d173939d79b7111794c52f75c183a78c7fc93ca13a927a27d0ccdc8d04e8",
  "private": false,
  "record": {
    "abstract": "Dispersion relations and amplitudes of collective pionic modes are derived in\na pi + nucleon-hole + delta-hole model for use in transport descriptions by\nmeans of a local density approximation. It is discussed how pionic modes can be\nconverted to real particles when penetrating the nuclear surface and how\nearlier treatments can be improved. When the surface is stationary only free\npions emerge. The time-dependent situation is also addressed, as is the\nconversion of non-physical (i.e. unperturbed delta-hole) modes to real\nparticles when the nuclear density vanishes. A simplified one-dimensional\nscenario is used to investigate the reflection and transmission of pionic modes\nat the nuclear surface. It is found that reflection of pionic modes is rather\nunlikely, but the process can be incorporated into transport descriptions by\nthe use of approximate local transmission coefficients.",
    "arxiv_id": "nucl-th/9508036",
    "authors": [
      "J. Helgesson",
      "J. Randrup"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/0375-9474(95)00433-5",
    "journal_ref": "Nucl.Phys. A597 (1996) 672-700",
    "title": "Treatment of Pionic Modes at the Nuclear Surface for Transport   Descriptions",
    "url": "https://arxiv.org/abs/nucl-th/9508036"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ae4c6ef5-a51a-4476-8ab4-f9ef60f4ecae",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}