{
  "annotation_id": "0fe2e4fb-91d8-486f-b936-8d35bf52696b",
  "date_created": "2026-03-02T18:00:21.714000Z",
  "date_modified": "2026-03-02T18:00:21.714000Z",
  "file_hash": "a49d3f83255a7c08af641ae10314f9002545db97e056448b0efe080ebc37f638",
  "private": false,
  "record": {
    "abstract": "We perform large shell model calculations for Calcium isotopes in the full fp\nshell by using the realistic Kuo-Brown interaction. The Calcium isotopes are\nespecially interesting because the nearest-neighbour spacing distribution P(s)\nof low-lying energy levels shows significant deviations from the predictions of\nthe Gaussian Orthogonal Ensemble of random--matrix theory. This contrasts with\nother neighbouring nuclei which show fully chaotic spectral distributions. We\nstudy the chaotic behaviour as a function of the excitation energy. In\naddition, a clear signature of chaos suppression is obtained when the\nsingle-particle spacings are increased. In our opinion the relatively weak\nstrength of the neutron-neutron interaction is unable to destroy the regular\nsingle-particle mean-field motion completely. In the neighbouring nuclei with\nboth protons and neutrons in valence orbits, on the other hand, the stronger\nproton-neutron interaction would appear to be sufficient to destroy the regular\nmean-field motion.",
    "arxiv_id": "nucl-th/9805049",
    "authors": [
      "V. R. Manfredi",
      "J. M. G. Gomez",
      "L. Salasnich"
    ],
    "categories": [
      "nucl-th"
    ],
    "title": "Large Shell Model Calculations for Calcium Isotopes: Spectral Statistics   and Chaos",
    "url": "https://arxiv.org/abs/nucl-th/9805049"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a34ee16f-d30a-4245-97df-fb07f6144465",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}