{
  "annotation_id": "b3b8e952-b6f6-4ff9-b394-ac615f4a8c5f",
  "date_created": "2026-03-02T18:00:22.410000Z",
  "date_modified": "2026-03-02T18:00:22.410000Z",
  "file_hash": "9131e3136c1d42812e77998d9f875b8773216455d016a52067be2f496cb9244a",
  "private": false,
  "record": {
    "abstract": "Starting from a nonmarkovian conserving relaxation time approximation for\ncollisions we derive coupled dispersion relations for asymmetric nuclear\nmatter. The isovector and isoscalar modes are coupled due to asymmetric nuclear\nmeanfield acting on neutrons and protons differently. A further coupling is\nobserved by collisional correlations. The latter one leads to the appearance of\na new soft mode besides isoscalar and isovector modes in the system. We suggest\nthat this mode might be observable in asymmetric systems. This soft mode\napproaches the isovector mode for high temperatures. At the same time the\nisovector mode remains finite and approaches a constant value at higher\ntemperatures showing a transition from zero sound like damping to first sound.\nThe damping of the new soft mode is first sound like at all temperatures.",
    "arxiv_id": "nucl-th/9802083",
    "authors": [
      "K. Morawetz",
      "R. Walke",
      "U. Fuhrmann"
    ],
    "categories": [
      "nucl-th",
      "physics.atm-clus",
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevC.57.2813",
    "journal_ref": "Phys.Rev.C57:2813-2817,1998",
    "title": "New collective mode due to collisional coupling",
    "url": "https://arxiv.org/abs/nucl-th/9802083"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "37e67fdf-1b0b-4742-97a6-5ddbcb22d009",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}