{"paper":{"title":"Westcott $g$ Factors Extended to Arbitrary Neutron Energy Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Westcott g-factors can now be calculated from any user-specified neutron energy spectrum rather than only Maxwellian distributions.","cross_cats":["physics.app-ph"],"primary_cat":"nucl-ex","authors_text":"A.M. Hurst, D.A. Matters, T. Kawano","submitted_at":"2026-02-05T18:42:31Z","abstract_excerpt":"Westcott $g$ factors are used in Neutron Activation Analysis (NAA) and Prompt Gamma-ray Activation Analysis (PGAA) to evaluate the impact of non-$1/v$ behavior in the neutron-capture cross sections of certain nuclei on activation product yields. This non-$1/v$ behavior arises from the presence of neutron resonances in the neutron-capture cross sections that overlap with the source neutron spectrum at low ($<5$~eV) energies. Historically, Westcott $g$ factors that have been cataloged for NAA and PGAA applications are the result of calculations that assume a Maxwellian neutron velocity distribut"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"we present an approach for calculating g factors with user-specified neutron spectra, and we apply these methods to obtain Westcott g-factors for guided- and cold-neutron beams at the Budapest Research Reactor and the Forschungsreaktor München II reactor.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The neutron spectra supplied for the Budapest and FRM II beams are accurately measured and that the ENDF/B-VIII.1 capture cross sections correctly represent the relevant low-energy resonances.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A general method is developed to compute Westcott g factors for arbitrary neutron spectra using ENDF/B-VIII.1 data, with applications to guided and cold beams at the Budapest Research Reactor and FRM II.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Westcott g-factors can now be calculated from any user-specified neutron energy spectrum rather than only Maxwellian distributions.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"74874001256aebec10b069c75ad1e4f7588991f8868bda209a8c81685e8aaf3d"},"source":{"id":"2602.05995","kind":"arxiv","version":2},"verdict":{"id":"84f0af1d-80be-48f7-a54c-4c28d3502abf","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T06:45:43.580297Z","strongest_claim":"we present an approach for calculating g factors with user-specified neutron spectra, and we apply these methods to obtain Westcott g-factors for guided- and cold-neutron beams at the Budapest Research Reactor and the Forschungsreaktor München II reactor.","one_line_summary":"A general method is developed to compute Westcott g factors for arbitrary neutron spectra using ENDF/B-VIII.1 data, with applications to guided and cold beams at the Budapest Research Reactor and FRM II.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The neutron spectra supplied for the Budapest and FRM II beams are accurately measured and that the ENDF/B-VIII.1 capture cross sections correctly represent the relevant low-energy resonances.","pith_extraction_headline":"Westcott g-factors can now be calculated from any user-specified neutron energy spectrum rather than only Maxwellian distributions."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2602.05995/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":39,"sample":[{"doi":"","year":2007,"title":"H. D. Choi, et al. (Eds.), Database of Prompt Gamma Rays from Slow Neutron Capture for Elemental Analysis, International Atomic Energy Agency, Vienna, Austria, 2007","work_id":"d5083c06-b6e6-4c1a-bc30-dc882127f203","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"S. F. Mughabghab, Resonance Properties and Thermal Cross Sections𝑍=1-102, 6th Edition, Elsevier Science, 2018","work_id":"2425196f-e126-425b-9230-295a313014ec","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"G. L. Molnár (Ed.), Handbook of Prompt Gamma Activation Analysis, Kluwer Academic, Dordrecht, the Netherlands, 2004","work_id":"c0d55334-a31e-4e82-9600-c0a1be00fe94","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1955,"title":"C. H. Westcott, The specification of neutron flux and nuclear cross-sections in reactor calculations, Journal of Nuclear Energy 2 (1955) 59 – 76","work_id":"84253a52-f538-49f7-8113-6d26b3399e95","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1960,"title":"C. H. Westcott, Effective cross section values for well-moderated thermal reactor spectra, Tech. Rep. CRRP-960, Atomic Energy of Canada Limited, Chalk River, Ontario (1960)","work_id":"6d279a57-9048-41cc-b220-9acc40f89aee","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":39,"snapshot_sha256":"d23f83c56d479e7181b8f3b6ed1e6d682c3e394288237eea836d4789fa8885ab","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"2dd99a78a8a61d60daf3aa352f5d0b51969b0b3312c38d0077de86ec0b347341"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}