{
  "abstract": "A static alpha eigenvalue capability was implemented in a modified version of the open-source Monte Carlo radiation transport code OpenMC and validated against Rossi-alpha measurements from 21 delayed-critical benchmark experiments and 33 subcritical configurations spanning fast, intermediate, and thermal systems with U-233, HEU, IEU, LEU, and plutonium fuels. The effective delayed neutron fraction was calculated using the k-prompt method, and the prompt neutron lifetime was calculated using the iterated fission probability method, both evaluated within the standard k-eigenvalue power iteration. The delayed-critical alpha eigenvalue was calculated from these quantities using the point kinetics equation alpha_dc = -beta_eff / ell_p. Agreement was generally within 10% for fast metal systems and within 5% for thermal solution systems. Subcritical extrapolation studies derived from the SHE-8 and STACY benchmark families show that alpha_dc remains stable as the system is driven subcritical.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.00907",
  "author_total": 4,
  "authors": [
    {
      "name": "William Zywiec"
    },
    {
      "name": "Alessandro Ingegno"
    },
    {
      "name": "David Heinrichs"
    },
    {
      "name": "Benoit Forget"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bgyc7cm4nnxt2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.00907",
  "fulltext_url": null,
  "id": "bgyc7cm4nnxt2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.00907",
  "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.app-ph"
    ],
    [
      "arxiv",
      "physics.atom-ph"
    ],
    [
      "arxiv",
      "physics.comp-ph"
    ],
    [
      "openalex",
      "2202|Nuclear reactor physics and engineering"
    ]
  ],
  "openalex": "W7163135315",
  "pdf_url": "https://arxiv.org/pdf/2606.00907",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bgyc7cm4nnxt2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2606.00907",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.00907"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.atom-ph",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.comp-ph",
      "subfield": "computational"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Rossi-alpha Benchmark Validation of a Static Alpha Eigenvalue Capability in OpenMC",
  "title_text": "Rossi-alpha Benchmark Validation of a Static Alpha Eigenvalue Capability in OpenMC",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/bgyc7cm4nnxt2",
  "venue": "arXiv",
  "versions": []
}