{
  "annotation_id": "31f43f35-63bd-4428-a218-ba062f8b93b7",
  "date_created": "2026-03-02T18:00:05.114000Z",
  "date_modified": "2026-03-02T18:00:05.114000Z",
  "file_hash": "86f8999b05c0d985a9d45abea248382543e2ef97e7e2de3f8826c8df43dcbb63",
  "private": false,
  "record": {
    "abstract": "It has been argued by Buckley et. al.(Phys. Rev. Lett. 92, 151102, 2004) that\nnuclear matter is a type-I rather than a type-II superconductor. The suggested\nmechanism is a strong interaction between neutron and proton Cooper pairs,\nwhich arises from an assumed U(2) symmetry of the effective potential, which is\nsupposed to originate in isospin symmetry of the underlying nuclear\ninteractions. To test this claim, we perform an explicit mean-field calculation\nof the effective potential of the Cooper pairs in a model with a simple\nfour-point pairing interaction. In the neutron star context, matter is very\nneutron rich with less than 10% protons, so there is no neutron-proton pairing.\nWe find that under these conditions our model shows no interaction between\nproton Cooper pairs and neutron Cooper pairs at the mean-field level. We\nestimate the leading contribution beyond mean field and find that it is is\nsmall and attractive at weak coupling.",
    "arxiv_id": "nucl-th/0505025",
    "authors": [
      "Mark Alford",
      "Gerald Good",
      "Sanjay Reddy"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.72.055801",
    "journal_ref": "Phys.Rev. C72 (2005) 055801",
    "title": "Isospin asymmetry and type-I superconductivity in neutron star matter",
    "url": "https://arxiv.org/abs/nucl-th/0505025"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e1bcde3d-a993-4dd6-839a-1306444547ce",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}