Unresolvable Identifier

arXiv:2604.19180 · detector doi_compliance · cross_source · 2026-05-20 03:15:24.179638+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.1524/ract.1992.57.1.136' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.

Paper page Integrity report arXiv Try DOI

Evidence text

H. Piel, S.M. Qaim, G. Stöcklin, "Excitation functions of (p,xn) reactions on natNi and highly enriched ⁶²Ni – possibility of production of medically important radioisotope ⁶²Cu at a small cyclotron," Radiochem. Acta 57, 136–140 (1992). https://doi.org/10.1524/ract.1992.57.1.136

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.1524/ract.1992.57.1.136",
  "raw_excerpt": "H. Piel, S.M. Qaim, G. St\u00f6cklin, \"Excitation functions of (p,xn) reactions on natNi and highly enriched \u2076\u00b2Ni \u2013 possibility of production of medically important radioisotope \u2076\u00b2Cu at a small cyclotron,\" Radiochem. Acta 57, 136\u2013140 (1992). https://doi.org/10.1524/ract.1992.57.1.136",
  "ref_index": 30,
  "verdict_class": "cross_source"
}