{
  "annotation_id": "bd19f856-6b4a-415a-aa90-b26ab7606d1c",
  "date_created": "2026-03-02T18:00:00.889000Z",
  "date_modified": "2026-03-02T18:00:00.889000Z",
  "file_hash": "e8ae6fde0fbd609878a1524f0839487c895f60ce2be6b1c00f8cee9497909ee2",
  "private": false,
  "record": {
    "abstract": "Highly-excited single-particle states in nuclei are coupled with the\nexcitations of a more complex character, first of all with collective\nphonon-like modes of the core. In the framework of the quasiparticle-phonon\nmodel we consider the structure of resulting complex configurations using the\n$1k_{17/2}$ orbital in $^{209}$Pb as an example. Although, on the level of one-\nand two-phonon admixtures, the fully chaotic GOE regime is not reached, the\neigenstates of the model carry significant degree of complexity that can be\nquantified with the aid of correlational invariant entropy. With artificially\nenhanced particle-core coupling, the system undergoes the doubling phase\ntransition with the quasiparticle strength concentrated in two repelling peaks.\nThis phase transition is clearly detected by correlational entropy.",
    "arxiv_id": "nucl-th/0404045",
    "authors": [
      "Chavdar Stoyanov",
      "Vladimir Zelevinsky"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.70.014302",
    "journal_ref": "Phys.Rev. C70 (2004) 014302",
    "title": "High-lying single-particle modes, chaos, correlational entropy, and   doubling phase transition",
    "url": "https://arxiv.org/abs/nucl-th/0404045"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e045c6b8-d06d-48f5-8b80-b4a216457bd9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}