{
  "annotation_id": "636aa421-968c-4d41-8259-70be1d841fc5",
  "date_created": "2026-03-02T18:00:18.904000Z",
  "date_modified": "2026-03-02T18:00:18.904000Z",
  "file_hash": "93c12207bd84bc4b05b6bdb414a9c2132c1957290e42e2b5ed8104bd1cb8f20f",
  "private": false,
  "record": {
    "abstract": "We calculate the electromagnetic moments and radii of the Delta(1232) in the\nnonrelativistic quark model, including two-body exchange currents. We show that\ntwo-body exchange currents lead to nonvanishing Delta and N--\u003eDelta transition\nquadrupole moments even if the wave functions have no D-state admixture. The\nusual explanation based on the single-quark transition model involves D-state\nadmixtures but no exchange currents. We derive a parameter- free relation\nbetween the N--\u003eDelta transition quadrupole moment and the neutron charge\nradius: Q(N--\u003eDelta) = r^2(neutron)/sqrt(2). Furthermore, we calculate the M1\nand E2 amplitudes for the process photon + N --\u003eDelta. We find that the E2\namplitude receives sizeable contributions from exchange currents. These are\nmore important than the ones which result from D-state admixtures due to tensor\nforces between quarks if a reasonable quark core radius of about 0.6 fm is\nused. We obtain a ratio of E2/M1=-3.5%.",
    "arxiv_id": "nucl-th/9610040",
    "authors": [
      "A. J. Buchmann",
      "E. Hernandez",
      "Amand Faessler"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.55.448",
    "journal_ref": "Phys.Rev.C55:448-463,1997",
    "title": "Electromagnetic Properties of the Delta(1232)",
    "url": "https://arxiv.org/abs/nucl-th/9610040"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "19ab54bc-b26c-42fa-9412-06d2d14e269d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}