{"id":"82448e41-27a2-44f8-8412-67f102dabc0d","arxiv_id":"1908.00471","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":5.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":6,"one_line_summary":"The IAEA Photonuclear Data Library is updated from 164 to 220 nuclides using new measurements, Fi-based data corrections, and Hauser-Feshbach model evaluations.","lead":"This report presents the updated IAEA Photonuclear Data Library, with evaluated gamma-ray reaction data for 220 nuclides up to 200 MeV. It combines new neutron-multiplicity measurements, model-based corrections of older data, and evaluations from five institutes into a single recommended dataset for applications like radiation shielding and medical isotope production.","discovery_kind":"extension","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Fi model dependence is acknowledged but not propagated; if CPNRM branching ratios are biased, the Fi-corrected targets and the final evaluations inherit that bias.","rationale":"The reader's weakest assumption is the same load-bearing point: Eq. (38) treats CPNRM's F_i as accurate, and model tuning to the resulting targets cannot expose a bias. The manuscript is transparent about the need to consider Fi uncertainties but stops short of quantifying them, which is a genuine gap given that a major part of the evaluation work uses this correction and the library is released without uncertainty estimates. This supports the CONDITIONAL verdict rather than REJECT: the library is still a useful coordinated compilation with new measurements and transparent documentation, and the concern is testable without invalidating the product. I therefore do not change the reader's verdict. A secondary, factual issue worth checking separately is the energy-range claim: Sec. V.D states some JENDL/PD-2016 files are limited to 140 MeV while Sec. VI says the library covers 220 nuclides up to 200 MeV; if unreconciled, that headline claim would need qualification, but it is not the primary load-bearing concern here.","tokens_in":68660,"tokens_out":6275,"duration_ms":65388,"concrete_test":"For a representative KAERI-evaluated nucleus (e.g., 94Zr), reconstruct sigma_eval(gamma,in) from Eq. (38) using CPNRM F_i and then using TALYS or CCONE F_i from the Sec. IV.B.2 style calculation; refit the TALYS parameters to each corrected target set and compare the final evaluated sigma(gamma,1n) and sigma(gamma,2n) in the GDR peak. If the peak values shift by more than the assigned experimental uncertainty, or by more than 5%, the Fi model dependence is a material limitation rather than a negligible correction.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The library's reliability claim rests on the Fi correction (Eq. 38), where experimental neutron yields are partitioned using CPNRM branching-ratio predictions. The paper's own intercomparison in Sec. IV.B.2 shows F1 and F2 vary substantially among six model codes for 181Ta, with CPNRM's values rising above 30 MeV while other codes do not, and states that Fi uncertainties from different codes and parameters need to be considered. Those uncertainties are not quantified or propagated into the final library. KAERI's automated TALYS tuning adopts the Fi-corrected data as evaluation targets, and the resulting evaluated files are released without uncertainty bars. Since TALYS and CPNRM are both Hauser-Feshbach statistical models, agreement between the tuned calculation and the corrected targets does not constitute an independent check; a common bias in the theoretical branching ratios would be invisible. Independent activation checks are given for only 181Ta, 209Bi, and 197Au, not for the many nuclides whose partial cross sections come from the Fi-corrected route. The acknowledged model dependence therefore directly weakens the central claim of improved, reliable partial photoneutron cross sections.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This paper reports the completion of the new IAEA Photonuclear Data Library 2019, which contains evaluated photo-induced reaction cross sections for 220 nuclides up to incident photon energies of 200 MeV. The authors describe the experimental data landscape, propose an evaluation methodology based on the theoretical branching-ratio factors Fi (Eq. 7) to correct problematic partial photoneutron cross sections, present the nuclear models and codes used (EMPIRE, TALYS, CCONE, MEND-G, GLUNF, CPNRM), summarize new evaluations at KAERI, IFIN-HH, JAEA, and CIAE, and provide an updated Atlas of GDR parameters. The library is released in ENDF-6 format and supersedes the 1999 IAEA library, which contained 164 nuclides.","tokens_in":68884,"tokens_out":6959,"duration_ms":67781,"significance":"If the library is accepted as reliable, it will be an important resource for shielding, reactor and fusion applications, medical isotope production, and astrophysics. The paper's concrete strengths are the compilation and critical assessment of a large body of experimental data, the development of the direct neutron-multiplicity sorting technique at NewSUBARU, the six-code intercomparison of model predictions, and the provision of a new GDR parameter atlas. However, the central claim of improved reliability for the partial photoneutron cross sections is weakened by the unquantified model dependence of the Fi correction and the absence of uncertainty information in the released files; these issues affect the main deliverable and need to be addressed.","major_comments":[{"comment":"The paper acknowledges that Fi values from the six codes differ substantially (CPNRM F1 and F2 increase above 30 MeV while the other codes do not) and that 'the uncertainties in Fi due to different codes and model parameters need to be considered.' Yet the library releases no uncertainty information for the evaluated partial cross sections, and the KAERI TALYS tuning (Sec. V.B) uses the Fi-corrected data as evaluation targets without propagating these Fi uncertainties. Since TALYS and CPNRM are both Hauser-Feshbach statistical codes, agreement between the tuned TALYS calculation and the Fi-corrected targets is not an independent validation; a common bias in the theoretical branching ratios would be invisible. To support the central reliability claim, the authors should either propagate Fi uncertainties into the evaluated files or clearly mark the partial cross sections as model-dependent estimates, and should extend the activation-based validation (currently only 181Ta, 209Bi, and 197Au) to more nuclides.","section":"Sec. IV.B.2 and Eq. (38)"},{"comment":"The 27Al(γ,p) data of Shoda et al. are shifted to lower energies by 4 MeV to match the reaction threshold, and the 14N data of Komar et al. are multiplied by 2.57 based on branching-ratio estimates from a single reference. These are large, ad hoc adjustments that directly shape the evaluated targets. No uncertainty or sensitivity analysis is given for these adjustments, and the figures do not show the unshifted/unscaled data for comparison. The authors should justify these adjustments quantitatively and demonstrate that the final evaluations are robust to the exact choice of shift and rescaling.","section":"Sec. V.E.4 and Sec. V.E.2"},{"comment":"The automated TALYS tuning adjusts about 19 optical-model parameters, roughly 35 level-density parameters, GDR parameters, and pre-equilibrium parameters, with deviations from defaults up to 50%. Such large adjustments risk overfitting and parameter compensation. The paper does not provide a goodness-of-fit measure, parameter sensitivities, or covariance estimates, so it is difficult to assess the reliability of the resulting cross sections in energy regions without experimental data. The authors should provide a summary of typical fitted parameter deviations and at least one representative covariance or sensitivity analysis.","section":"Sec. V.B"},{"comment":"Section VI states that a unique set of evaluations was selected based mainly on how well each evaluation reproduces the recommended experimental data, but no quantitative criteria are given and no overall statistical comparison (e.g., distributions of deviations between evaluated and experimental files) is presented for the 220 nuclides. The claim that the library is improved would be much better supported by a global benchmark table or a summary of validation metrics across all nuclides.","section":"Sec. VI"}],"minor_comments":[{"comment":"There are several typographical errors that should be corrected: 'he new 2019 IAEA Photonuclear Data Library' in Sec. VII (missing 'T'), 'diffculty' in Sec. VI, 'fort the production' in Sec. I, and 'photoncouting' in the title of Ref. [30].","section":"General"},{"comment":"The sentence 'In Table I of Ref. [160], a relative yield of the (γ,np) reaction is reported to be 35%, while there are two channels given, 16% of (γ,n) and 11% of (γ,3αpn), which produce one neutron' is hard to parse; the branching-ratio accounting should be rewritten for clarity.","section":"Sec. V.E.2"},{"comment":"The GDR Atlas tables in Appendix B would benefit from a brief explanation of the fitting procedure and the uncertainty ranges, since the reference abbreviations are not expanded and the table notes are minimal.","section":"Appendix B"}],"recommendation":"major_revision","confidential_remarks":"This manuscript is a comprehensive and potentially very useful deliverable for the nuclear data community, and the journal is an appropriate venue. The main concern is the lack of propagated or quantified uncertainties in the partial photoneutron cross sections, which is directly acknowledged in the text but not resolved in the released library; this should be the focus of the revision. The paper is very long, and the authors might consider whether part of the GDR atlas material should be published separately, but this is a presentation choice rather than a scientific defect."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"The new library is a real increment: 220 nuclides versus 164 in the 1999 version, 56 new evaluations, an updated GDR atlas, and a set of NewSUBARU measurements using the flat-efficiency detector. That alone justifies the paper. It is also unusually transparent about how the evaluations were made; you can see which institute did what, which experimental sets were used, and where the authors had to adjust data. The comparison plots show the evaluations against the underlying experiments rather than just the final curves, which I trust more because of that.\n\nThe load-bearing weakness is exactly what the stress-test says. Eq. (38) makes the evaluated partial cross sections equal to the measured neutron yield multiplied by CPNRM's theoretical Fi. Those Fi-corrected data are then used as targets for the TALYS tuning at KAERI. Since TALYS and CPNRM are both Hauser-Feshbach codes, the later validation against the corrected data is not independent. The authors acknowledge in Sec. IV.B.2 that Fi uncertainties differ among codes and should be considered, but the shipped files have no uncertainty bars. That is the single biggest gap. A user reading the library has no way to know how much of the partial cross section is model and how much is measurement.\n\nThe paper also has small-to-moderate warts. The 14N Komar data are re-scaled by a factor 2.57 with a branching-ratio argument, and the 27Al(γ,p) data are shifted down by 4 MeV; these are plausible but ad hoc, and the quantitative justification is thin. The KAERI tuning allowed parameters to move up to 50% from defaults, which is a lot for a supposedly predictive statistical model. The code intercomparison for 181Ta shows CPNRM's F1 and F2 rising above 30 MeV where the other codes do not, so the Fi route is least reliable where pre-equilibrium matters. On the other hand, the independent activation checks for 181Ta, 209Bi, and 197Au are good evidence, and they do validate the method for those three nuclei.\n\nOverall I think the paper earns its place. The library is likely an improvement over the 1999 version for applied work, and the documentation of the evaluation process is a service to the community. But the release without uncertainty estimates is a substantial weakness, and I'd want the Fi model dependence quantified per nuclide before calling the partial cross sections fully reliable. The right fix is a companion uncertainty file or a clear statement of which nuclides are Fi-dependent; that can be done without redoing the whole library.\n\nWho gets value: applied nuclear data users, reactor and shielding people, medical isotope folks, and evaluators. It is a solid reference paper, not a revolution. I would send it to peer review, but I would expect the referees to push on the Fi uncertainty question. If I worked in photonuclear data, I'd cite it.","headline":"A genuinely useful updated photonuclear library, but the Fi-correction method injects unquantified model dependence into the partial cross sections, and the lack of uncertainty bars is the main thing holding it back.","tokens_in":69633,"tokens_out":2675,"would_cite":true,"duration_ms":28701,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":["25.20.-x","24.30.Cz"],"model":"deepseek-v4-flash","headline":"The updated Photonuclear Data Library covers 220 nuclides to 200 MeV and uses model-based Fi corrections to fix partial photoneutron cross sections.","keywords":["photonuclear reactions","giant dipole resonance","photoneutron cross sections","evaluated nuclear data","neutron multiplicity sorting","statistical model","medical isotope production","nuclear data library"],"falsifier":"Take a nucleus in the new library whose partial cross sections rest on Fi-corrected older data, such as 133Cs or 94Zr, measure (γ,1n), (γ,2n), and (γ,3n) with direct neutron-multiplicity sorting across 10–40 MeV using a flat-efficiency detector, and compare channel by channel; if the direct sorting tracks the uncorrected raw data rather than the Fi-corrected curve, the model branching ratios are falsified for that nucleus.","tokens_in":68406,"feed_emoji":"⚛️","tokens_out":6133,"duration_ms":63986,"temperature":0.7,"pith_summary":"This paper presents a coordinated update of the international photonuclear data library, expanding it from 164 to 220 nuclides and extending evaluated photon energies to 200 MeV. Its central methodological claim is that long-standing discrepancies between partial photoneutron cross-section measurements, especially in the one-neutron versus two-neutron channels, can be diagnosed and corrected using a model-based Fi ratio that splits the measured neutron yield into partial channels under constraints the data themselves often violate. The paper argues that evaluations built this way, combined with new direct neutron-multiplicity sorting measurements and updated giant-dipole-resonance parameters, are more reliable than the previous 1999 library and are suitable for radiation transport, radiotherapy dose calculations, fission and fusion applications, and medical isotope production.","feed_headline":"New photonuclear library: 220 isotopes, 200 MeV","feed_subtitle":"It adds 56 nuclides and corrects long-standing one- versus two-neutron discrepancies with model-based Fi ratios.","key_machinery":"The central object is the Fi correction factor, defined as the share of the neutron-yield cross section carried by the $i$-neutron partial channel; it is used in Eq. (38) to convert an experimental neutron yield into evaluated partial channels, imposing the physical inequalities that many raw data violate. The second load-bearing element is the direct neutron-multiplicity sorting technique with a flat-efficiency detector, which provides experimental partial cross sections that avoid the ring-ratio unfolding assumptions of older detectors. Third, statistical Hauser-Feshbach decay codes with giant-dipole-resonance and quasi-deuteron photo-absorption provide the overall model framework, and an inter-comparison across several codes was used to gauge how much the theoretical Fi values depend on model choices.","core_discovery":"The new library provides evaluated photo-absorption, photoneutron, and charged-particle emission data for 220 isotopes up to 200 MeV, grounded in a consistency test: each experimental partial photoneutron cross section $\\sigma(\\gamma,inX)$ is compared with the ratio $F_i = \\sigma(\\gamma,inX)/\\sigma(\\gamma,xn)$, which by definition cannot exceed $1$, $1/2$, or $1/3$ for $i=1,2,3$. Many existing experimental data sets violate these bounds, a signature of neutron mis-counting in the multiplicity-sorting method. The paper therefore evaluates partial cross sections by multiplying the experimental neutron yield $\\sigma(\\gamma,xn)$ by theoretical $F_i$ values from a combined photonuclear reaction model, giving $\\sigma_{\\rm eval}(\\gamma,in)=F_i^{\\rm th}\\,\\sigma_{\\rm exp}(\\gamma,xn)$, a construction that automatically satisfies the bounds. Comparisons for a selection of nuclei show the corrected partial cross sections agree with activation measurements and with new laser Compton-scattering data, and the paper recommends against simply normalizing the discrepant older data.","pith_inferences":["If the model Fi ratios are close to correct, the same correction could be extended to every nuclide with a measured neutron yield but no reliable multiplicity sorting, substantially enlarging the practical coverage of the library.","A sharper prospective test than the paper's own activation checks would be to apply direct neutron-multiplicity sorting to a nucleus currently evaluated only from Fi-corrected older data, such as 133Cs or 94Zr; agreement would transfer the method's credibility to the rest of the library.","The code comparison shows that Fi varies with energy and with model choice, which suggests the library would benefit from assigning an energy-dependent uncertainty band to each corrected partial cross section rather than a single global uncertainty.","Because evaluations that tune model parameters to Fi-corrected data inherit the method's assumptions, the library's predictive power for medical isotope production depends on how well the model's branching ratios generalize to isotopes with no experimental anchor."],"forward_implications":["The library extends evaluated photonuclear data to 200 MeV, so transport simulations for accelerator shielding, transmutation, and related applications can use a single consistent data set.","For roughly 40 nuclei where older quasi-monoenergetic beam data disagreed in the partial channels, the Fi correction gives a principled way to supersede or select among the data without invoking a global normalization factor.","The new flat-efficiency detector measurements provide an independent experimental anchor for partial cross sections, and the same technique can be deployed on other isotopes to test further evaluations.","The accompanying atlas of giant-dipole-resonance parameters and the photon strength function database give modelers a consistent input set for future evaluations of nuclei not in the library."],"supporting_citations":[{"why":"Defines the previous 1999 library and its evaluation methods, which the new work updates, extends, and benchmarks against.","marker":"[3]"},{"why":"Introduces the Fi consistency ratio used to assess and correct experimental partial photoneutron cross sections.","marker":"[12]"},{"why":"Reports the direct neutron-multiplicity sorting technique with a flat-efficiency detector used for the new cross-section measurements.","marker":"[10]"},{"why":"Provides updated giant-dipole-resonance parameters with uncertainties used in the photo-absorption part of the evaluations.","marker":"[8]"},{"why":"The EXFOR database is the compilation source for the experimental data entering each evaluation.","marker":"[9]"},{"why":"The combined photonuclear reaction model code whose theoretical Fi values enter Eq. (38) for the corrected partial cross sections.","marker":"[95, 96]"}],"fun_headline_variants":[],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The entire Fi correction rests on the assumption that the theoretical branching ratios from the model code are accurate enough that multiplying an experimental neutron yield by them yields true partial cross sections; if those ratios are biased, the bias is baked into evaluations that then tune the model to reproduce its own shape.","fun_headline_variants_meta":{"error":"Client error '402 Payment Required' for url 'https://api.deepseek.com/chat/completions'\nFor more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/402"},"cache_creation_input_tokens":0},"created_at":"2026-08-14T15:53:24.019651+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Take a nucleus in the new library whose partial cross sections rest on Fi-corrected older data, such as 133Cs or 94Zr, measure (γ,1n), (γ,2n), and (γ,3n) with direct neutron-multiplicity sorting across 10–40 MeV using a flat-efficiency detector, and compare channel by channel; if the direct sorting tracks the uncorrected raw data rather than the Fi-corrected curve, the model branching ratios are falsified for that nucleus.","supporting_citations":[],"review_version":1}