{
  "annotation_id": "943b0542-f946-4bfe-8b6a-713b23fa054c",
  "date_created": "2026-03-02T18:00:07.961000Z",
  "date_modified": "2026-03-02T18:00:07.961000Z",
  "file_hash": "26593f2812f2164ba980ca0e30254ffa31455f52f6d48f71ff7d5b5e0bb0dd47",
  "private": false,
  "record": {
    "abstract": "Experimental energy spectrum and B(E2) values in 68Ni and 90Zr indicate a\ndouble-magic character in these neutron-rich nuclei with N or Z=40. The data\nnevertheless do not show any pronounced irregularity in two-nucleon separation\nenergy. To understand the underlying physics, we carry out both shell-model and\nmean-field calculations. The shell-model calculation can well reproduce all the\nobservations. It is understood from the mean-field results for 68Ni that the\nshell gap at N=40 disappears due to dynamical correlations of the isovector J=0\npairing interaction. In 90Zr, however, such a dynamic process with the J=0\npairing appears not important because of the strong contribution of the J\u003e0\ninteraction. We study also level schemes in the Ni isotopes and N=50 isotones.\nWe predict a new band built on the $0_{2}^{+}$ state in both 68Ni and 90Zr. The\nstates of this band are dominated by two-particle-two-hole excitations from the\nfp-shell to the intruder g_{9/2} orbit.",
    "arxiv_id": "nucl-th/0607063",
    "authors": [
      "K. Kaneko",
      "M. Hasegawa",
      "T. Mizusaki",
      "Y. Sun"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.74.024321 10.1103/PhysRevC.74.049901",
    "journal_ref": "Phys.Rev.C74:024321,2006; Erratum-ibid.C74:049901,2006",
    "title": "Magicity and occurrence of band with enhanced B(E2) in neutron-rich   nuclei 68Ni and 90Zr",
    "url": "https://arxiv.org/abs/nucl-th/0607063"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b0b8feab-883d-40ed-ac02-b9cee120d471",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}