{
  "abstract": "Purpose: Alpha particles from $^{214}$Po, $^{212}$Po, and $^{210}$Po are increasingly used to calibrate large liquid scintillator detectors, but Geant4 simulations of their energy deposition require detailed validation. Methods: We simulate alpha particles in a 4 m cube of LAB-based liquid scintillator with Geant4 11.4.2 and apply Birks quenching per step. We study step-size, production-threshold, Birks-constant, and electromagnetic-model dependence, and use Geant4-DNA to examine keV-scale electron track structure. Results: Delta-electron-associated fluctuations dominate the simulated response. Across the tested explicit-delta settings, the variance of the quenched-response contribution from secondary tracks is 1.01--1.12 times the total variance; a negative primary--secondary covariance reduces the total. The simulated quenching-curve shape is compatible with SNO+ data within current uncertainties, with $χ^2/\\mathrm{ndf}\\simeq0.14$--$0.17$ for $k_B=0.007$--$0.010$ g cm$^{-2}$ MeV$^{-1}$. Geant4-DNA gives strong electron-track curvature, with tortuosity decreasing from about 6 at 200 eV to 1.6 at 10 keV. Conclusion: Delta-electron fluctuations are the dominant contribution to the intrinsic resolution in the tested configurations. The production threshold has a larger effect than the electromagnetic model: Penelope and Livermore agree within about 3% in L/E, whereas Standard gives higher L/E, especially at low thresholds.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.23793",
  "author_total": 3,
  "authors": [
    {
      "name": "Shiwen Xu"
    },
    {
      "name": "Shubing Liu"
    },
    {
      "name": "Zeyuan Yu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/91sb6xg0pby1e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.23793",
  "fulltext_url": null,
  "id": "91sb6xg0pby1e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.23793",
  "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",
      "hep-ex"
    ],
    [
      "openalex",
      "3108|Radiation Detection and Scintillator Technologies"
    ]
  ],
  "openalex": "W7214040101",
  "pdf_url": "https://arxiv.org/pdf/2609.23793",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/91sb6xg0pby1e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.23793",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.23793"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Detailed investigation on the Geant4 simulation of alpha particles in liquid scintillator detector",
  "title_text": "Detailed investigation on the Geant4 simulation of alpha particles in liquid scintillator detector",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/91sb6xg0pby1e",
  "venue": "arXiv",
  "versions": []
}