{
  "abstract": "Radioactive nuclei in neutron-star merger ejecta carry information about both their abundance and their production history. Using the $^{225}\\mathrm{Ra}$-$^{225}\\mathrm{Ac}$ sequence, we establish exact conditions linking a surviving isotope partition to the time available for parent decay. An Ac fraction of 0.1 produced solely through Ra decay requires at least 2.456 days, providing a direct consistency test for proposed source states. We show that subsequent activity retains additional production memory: two histories with the same mean birth time can produce different response crossings. This distinction is captured analytically and separates mean chronology from the influence of the production-time distribution. A controlled radiation calculation then shows how deposition and photon escape transform the nuclear contrast into a common light-curve pivot for fixed ejecta properties. The results connect nuclear production chronology to late-time merger emission and provide benchmarks for nucleosynthesis and radiation-transport calculations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.11095",
  "author_total": 1,
  "authors": [
    {
      "name": "Hisham Anwer"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fjtdjad10gsyh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.11095",
  "fulltext_url": null,
  "id": "fjtdjad10gsyh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.11095",
  "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",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7221170258",
  "pdf_url": "https://arxiv.org/pdf/2610.11095",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fjtdjad10gsyh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.11095",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.11095"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Production Memory of the $^{225}\\mathrm{Ra}$-$^{225}\\mathrm{Ac}$ Clock in Neutron-Star Merger Ejecta",
  "title_text": "Production Memory of the ^225Ra-^225Ac Clock in Neutron-Star Merger Ejecta",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/fjtdjad10gsyh",
  "venue": "arXiv",
  "versions": []
}