{
  "annotation_id": "da75e514-701f-4881-bfb6-62d92cc18167",
  "date_created": "2026-03-02T18:00:01.498000Z",
  "date_modified": "2026-03-02T18:00:01.498000Z",
  "file_hash": "4704d70903fa77385f6f54aa762028e644d73e12bcbb184354d301424d93814b",
  "private": false,
  "record": {
    "abstract": "The evolution of the N=28 neutron shell closure is studied in the N=28\nisotones from neutron drip line\u0027s $^{40}$Mg to N=Z doubly magic $^{56}$Ni. It\nis found that the N=28 closure vanishes at Z=12 in favor of a deformed ground\nstate. For Z=14 and Z=16 closed shell and intruder configurations are almost\ndegenerate, leading to highly mixed ground states and to very low lying excited\n0$^+$ states. For Z$\u003e$20 the intruder states are always above the closed shell\nground states. We examine their structure and their possible existence as\ncollective yrare bands of well defined particle-hole character.",
    "arxiv_id": "nucl-th/0403080",
    "authors": [
      "Etienne Caurier",
      "Frederic Nowacki",
      "Alfredo Poves"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2004.06.032",
    "journal_ref": "Nucl.Phys. A742 (2004) 14-26",
    "title": "The N=28 shell closure; from N=Z to the neutron drip line",
    "url": "https://arxiv.org/abs/nucl-th/0403080"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "54e5f2f6-7ef0-4435-b31d-0b807448ecc2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}