{
  "annotation_id": "a7180b9e-f94c-4523-985f-bc8d9557e364",
  "date_created": "2026-03-02T18:00:14.937000Z",
  "date_modified": "2026-03-02T18:00:14.937000Z",
  "file_hash": "06f117f8b63655c914ef3b6ae282cb3d8cfbdc7a762f94128046a39d18e4eca0",
  "private": false,
  "record": {
    "abstract": "Shell model calculations are performed for magnetic dipole excitations in\n$^8{Be}$ and $^{10}{Be}$ in which all valence configurations plus\n$2\\hbar\\omega$ excitations are allowed (large space). We study both the orbital\nand spin excitations. The results are compared with the `valence space only\u0027\ncalculations (small space). The cumulative energy weighted sums are calculated\nand compared for the $J=0^+$ $T$=0 to $J=1^+$ $T$=1 excitations in $^8{Be}$ and\nfor $J=0^+$ $T$=1 to both $J=1^+$ $T$=1 and $J$=$1^+$ $T$=2 excitations in\n$^{10}{Be}$. We find for the $J=0^+$ $T$=1 to $J=1^+$ $T$=1 isovector\n{\\underline {spin}} transitions in $^{10}{Be}$ that the summed strength in the\n{\\underline {large}} space is less than in the {\\underline {small}} space. We\nfind that the high energy energy-weighted isovector orbital strength is smaller\nthan the low energy strength for transitions in which the isospin is changed,\nbut for $J=0^+$ $T$=1 to $J=1^+$ $T$=1 in $^{10}{Be}$ the high energy strength\nis larger. We find that the low lying orbital strength in $^{10}{Be}$ is\nanomalously small, when an attempt is made to correlate it with the $B(E2)$\nstrength to the lowest $2^+$ states. On the other hand a sum rule of Zheng and\nZamick which concerns the total $B(E2)$ strength is reasonably satisfied in\nboth $^8{Be}$ and $^{10}{Be}$. The Wigner supermultiplet scheme is a useful\nguide in analyzing shell model results. In $^{10}Be$ and with a $Q \\cdot Q$\ninteraction the T=1 and T=2 scissors modes are degenerate, with the latter\ncarrying 5/3 of the T=1 strength.",
    "arxiv_id": "nucl-th/9502042",
    "authors": [
      "M. S. Fayache",
      "S. Shelly Sharma",
      "L. Zamick"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1006/aphy.1996.0109",
    "title": "Scissors Modes and Spin Excitations in Light Nuclei including $\\Delta   N$=2 excitations: Behaviour of $^8Be$ and $^{10}Be$",
    "url": "https://arxiv.org/abs/nucl-th/9502042"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "96ea5b8c-bb82-45c8-9864-447a235fa944",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}