{
  "abstract": "The post-asymptotic giant branch (post-AGB) star IRAS 14325-6428 exhibits a peculiar heavy-element abundance pattern, characterized by a high [Ba/La] ratio and an anomalous odd-isotope Ba ratio ( f odd,Ba = 0.25 ± 0.08), which is difficult to explain via the classical slow neutron-capture process ( s -process). We theoretically investigate this abundance pattern by considering the intermediate neutron-capture process ( i -process) nucleosynthesis. The i -process nucleosynthesis calculations are performed with a one-zone network (NucNet Tools) at constant temperature and density, using intershell abundances obtained from a stellar model (1.5 M ⊙ , Z = 0.003) evolved with MESA to the thermally pulsing AGB phase. The observed heavy-element abundances are best reproduced by a model with neutron density N n = 5 × 10 ¹³ cm ⁻³ and neutron exposure τ = 1.4 mbarn ⁻¹ , followed by dilution with a scaled-solar composition. This model reproduces the high [Ba/La] and [Ba/Ce] ratios and yields a postdilution odd-isotope fraction f odd,Ba ≈ 0.51, which is supported by the observed value being substantially above the expectations of the pure s -process. The abundance pattern arises from the i -process path approaching the neutron magic number N = 82, where the flow slows, and the material accumulates at ¹³⁵ I, which subsequently β ⁻ decays to ¹³⁵ Ba, enhancing Ba production and reducing the synthesis of heavier species. Combined with its multielement i -process classification, our results provide quantitative support for a dominant i -process origin of the heavy elements in IRAS 14325−6428, likely triggered by a relatively short-lived proton-ingestion episode in its AGB progenitor.",
  "abstract_shown": true,
  "affiliations": [
    "Chinese Academy of Sciences",
    "University of Chinese Academy of Sciences",
    "Inner Mongolia Minzu University",
    "Inner Mongolia Joint Key Laboratory of Nuclear and Radiation Detection",
    "China Institute of Atomic Energy"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Guo Li",
      "orcid": "0000-0002-3856-1108"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Jian-Rong Shi",
      "orcid": "0000-0002-0349-7839"
    },
    {
      "affs": [
        2,
        3
      ],
      "name": "Su-Ya-La-Tu Zhang",
      "orcid": "0000-0002-9580-4209"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Hong-Liang Yan",
      "orcid": "0000-0002-8609-3599"
    },
    {
      "affs": [
        4
      ],
      "name": "Yong-Shou Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2sg1xptgjraqf.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aeb015",
  "fulltext_url": null,
  "id": "2sg1xptgjraqf",
  "issns": [
    "1538-4357",
    "0004-637X"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeb015",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "astronomy/general"
    ]
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  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeb015/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/2sg1xptgjraqf.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T12:20:12Z",
      "native_id": "10.3847/1538-4357/aeb015",
      "source": "feed-iop",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeb015"
    },
    {
      "first_seen": "2026-11-05T12:20:35Z",
      "native_id": "10.3847/1538-4357/aeb015",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeb015"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Theoretical Study of i-process Contribution to the Post-AGB Star IRAS 14325-6428",
  "title_text": "Theoretical Study of i-process Contribution to the Post-AGB Star IRAS 14325-6428",
  "type": "peer-reviewed",
  "updated_at": "2026-11-07T00:20:58Z",
  "url": "https://research.draconitic.com/paper/2sg1xptgjraqf",
  "venue": "The Astrophysical Journal",
  "versions": []
}