{
  "abstract": "The radioisotope $^{229}$Pa is predicted to possess a nearly degenerate ground-state parity doublet. Previous $γ$-ray and conversion-electron spectroscopy suggests a splitting of $ΔE = (60\\pm 50)~\\mathrm{eV}$, although the doublet's existence remains unconfirmed. Such a small splitting would give $^{229}$Pa an exceptionally large enhancement of symmetry-violating nuclear properties. However, the splitting, and with it the sensitivity of $^{229}$Pa to CP-violating physics, remains uncertain by orders of magnitude. We propose an experiment to measure this splitting with sub-eV precision within a few days of measurement time by using delayed-coincidence internal-conversion spectroscopy of $^{229}$Pa ions produced by the electron-capture decay of $^{229}$U$^{+}$ ions stored in a Penning trap at the Facility for Rare Isotope Beams (FRIB). This measurement would provide the key nuclear-structure input needed to establish $^{229}$Pa as a leading candidate for next-generation atomic and molecular electric-dipole-moment (EDM) experiments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.05494",
  "author_total": 10,
  "authors": [
    {
      "name": "Silviu-Marian Udrescu"
    },
    {
      "name": "Aiden Boyer"
    },
    {
      "name": "Lan Cheng"
    },
    {
      "name": "Ronald Fernando Garcia Ruiz"
    },
    {
      "name": "Phay J. Ho"
    },
    {
      "name": "Ryan Ringle"
    },
    {
      "name": "Jaideep T. Singh"
    },
    {
      "name": "Patrick R. Stollenwerk"
    },
    {
      "name": "Georg Tiebel"
    },
    {
      "name": "Margaret J. Tseng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4gqfsnbvyyjpb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.05494",
  "fulltext_url": null,
  "id": "4gqfsnbvyyjpb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.05494",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "physics.atom-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.05494",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4gqfsnbvyyjpb.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.05494",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.05494"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.atom-ph",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Search for the 229Pa Parity Doublet via Internal-Conversion Spectroscopy at FRIB",
  "title_text": "Search for the 229Pa Parity Doublet via Internal-Conversion Spectroscopy at FRIB",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:18Z",
  "url": "https://research.draconitic.com/paper/4gqfsnbvyyjpb",
  "venue": "arXiv",
  "versions": []
}