{
  "abstract": "A $I^π$ = (29/2$^{+}$) metastable state with $T_{1/2}$ $ > $ 10 s at $E_{x}$ = 2102 keV has been identified in the stable nucleus, $^{197}$Au. Its decay exhibits the unusual coexistence of a strongly hindered $E2$ transition and a competing $E4$ branch with comparable intensity, indicating the simultaneous presence of shape- and spin-related hindrance mechanisms. Such a decay pattern has not previously been identified in a long-lived nuclear state and serves as a sensitive probe of the interplay between shell structure, configuration mixing, and collective degrees of freedom. This result establishes an important benchmark for modern nuclear-structure models, for which a unified description of all observables remains challenging.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.25915",
  "author_total": 11,
  "authors": [
    {
      "name": "S. K. Tandel"
    },
    {
      "name": "D. Rathore"
    },
    {
      "name": "M. Hemalatha"
    },
    {
      "name": "Subhrajit Sahoo"
    },
    {
      "name": "P. C. Srivastava"
    },
    {
      "name": "P. Chowdhury"
    },
    {
      "name": "R. V. F. Janssens"
    },
    {
      "name": "F. G. Kondev"
    },
    {
      "name": "M. P. Carpenter"
    },
    {
      "name": "T. Lauritsen"
    },
    {
      "name": "D. Seweryniak"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4bs322pvwzj6k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.25915",
  "fulltext_url": null,
  "id": "4bs322pvwzj6k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.25915",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "openalex",
      "3106|Nuclear physics research studies"
    ]
  ],
  "openalex": "W7223043832",
  "pdf_url": "https://arxiv.org/pdf/2610.25915",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4bs322pvwzj6k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.25915",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.25915"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Singular observation of shape and spin hindrance in metastable nuclear decay of $^{197}$Au",
  "title_text": "Singular observation of shape and spin hindrance in metastable nuclear decay of ^197Au",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/4bs322pvwzj6k",
  "venue": "arXiv",
  "versions": []
}