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arxiv: 2001.11140 · v3 · pith:MMM4O26Cnew · submitted 2020-01-30 · ⚛️ physics.app-ph · nucl-ex

The Baghdad Atlas: A relational database of inelastic neutron-scattering (n,n'γ) data

A.M. Hurst , L.A. Bernstein , T. Kawano , A.M. Lewis , K. Song This is my paper

Pith reviewed 2026-05-24 15:02 UTC · model grok-4.3

classification ⚛️ physics.app-ph nucl-ex
keywords inelastic neutron scattering(n,n'γ)gamma-ray spectranuclear databaseBaghdad Atlasflux-weighted cross sectionsrelational databaseDemidov
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The pith

A relational database converts the 1978 Baghdad Atlas of inelastic neutron-scattering gamma-ray data into a queryable resource for cross-section extraction.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents a relational database compiled from the original (n,n'γ) measurements in the 1978 Baghdad Atlas by Demidov et al., covering 105 measurements on 76 natural and 29 enriched elemental samples. It organizes γ-ray energies, relative intensities, nuclide and level data, plus metadata that supports extraction of flux-weighted partial γ-ray cross sections relative to a chosen reference value. The 846.8-keV transition in 56Fe is adopted as the reference at 143(29) mb, though users can substitute other values. Python scripts build the database from CSV files for local access through SQLite or a Jupyter interface, with distributed examples. A sympathetic reader would care because the work makes decades-old experimental nuclear data immediately usable in modern applications without requiring new beam time for every query.

Core claim

A relational database has been developed based on the original (n,n'γ) work carried out by A. M. Demidov et al. at the Nuclear Research Institute in Baghdad, Iraq, for 105 independent measurements comprising 76 elemental samples of natural composition and 29 isotopically-enriched samples. The information from this Atlas includes γ-ray energies and relative intensities, nuclide and level data corresponding to the residual nucleus, and meta data associated with the target sample that allows for the extraction of the flux-weighted (n,n'γ) cross sections for a given transition relative to a defined value. The optimized angular-distribution-corrected fast-neutron flux-weighted partial γ-ray cross

What carries the argument

The relational database compiled from the Baghdad Atlas CSV files, which stores γ-ray energies, intensities, level assignments, and sample metadata to enable flux-weighted cross-section extraction relative to the 56Fe reference transition.

If this is right

  • Users can query the database directly for γ-ray production cross sections across the listed nuclei and transitions.
  • Alternative reference cross-section values can be substituted without rebuilding the database.
  • The SQLite structure and Python scripts support integration into larger nuclear-data workflows or simulation codes.
  • Historical data from both natural and isotopically enriched targets become available for systematic comparisons.
  • The same digitization approach can preserve other legacy (n,n'γ) data sets in compatible formats.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The database could serve as a test bed for checking consistency between old reactor-neutron data and modern monoenergetic or time-of-flight measurements.
  • It might highlight nuclei where level-scheme or intensity discrepancies warrant targeted new experiments.
  • Wider adoption could reduce duplication of effort when evaluating neutron-induced gamma production for shielding or activation calculations.
  • The Jupyter interface lowers the barrier for non-specialists to explore the data for educational or applied purposes.

Load-bearing premise

The 1978 Atlas measurements, level assignments, and intensity values are transcribed accurately and remain suitable for modern use without independent re-validation or uncertainty updates.

What would settle it

A modern re-measurement of the flux-weighted (n,n'γ) cross section for the 846.8-keV transition in 56Fe or for a transition in another listed nuclide that lies outside the stated 143(29) mb uncertainty band.

Figures

Figures reproduced from arXiv: 2001.11140 by A.M. Hurst, A.M. Lewis, K. Song, L.A. Bernstein, T. Kawano.

Figure 1
Figure 1. Figure 1: The IRT-M Baghdad reactor neutron flux in arbi [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: The black circles correspond to the IRT-M neutron [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Angular distribution functions plotted for the 846.8- [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Anisotropy-attenuation coefficients: (a) [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Experimental W(90◦) function determined ac￾cording to the interpolated ak coefficients [17] over a range of incident-neutron energies from level-excitation threshold to 14 MeV for the 846.8-keV γ-ray transition in 56Fe. The fitted cubic spline used for interpolation in the analysis is shown. neutron energy increases leading to increasingly ori￾ented states that rapidly diverge from the theoretical case of … view at source ↗
Figure 6
Figure 6. Figure 6: Experimental a2 anisotropy coefficients [17] for γ-ray transitions in 56Fe at (a) 1238.3 keV, and (b) 1810.8 keV. The W(90◦) functions, deduced according to interpolated experimental ak coefficients, are compared in (c) for the three strongest γ-ray transitions in 56Fe at 846.8, 1238.3, and 1810.8 keV. partial γ-ray production cross sections for all Atlas￾reported Iγ(90◦ ) data [7]. This expectation value … view at source ↗
Figure 7
Figure 7. Figure 7: Calculated γ-ray production cross section as a function of the incident neutron energy obtained using the reaction code CoH3 [19] for γ-ray transitions in 56Fe at (a) 846.8 keV, (b) 1238.3 keV, and (c) 1810.8 keV. See text for calculation details. σG = 1.0 mb, and (iii) a global parametrization [27, 28] for the giant quadrupole resonance according to the isoscalar plus isovector model of the photon strengt… view at source ↗
Figure 8
Figure 8. Figure 8: Experimentally-deduced W(90◦) correction factors (data points) compared to the overall W(θ) angular distribu￾tion function (dotted curves) corresponding to the deduced flux-weighted neutron-expectation energy giving rise to the three strongest 56Fe γ rays at (a) 846.8 keV [2+ 1 → 0 + gs; E2], (b) 1238.3 keV [4+ 1 → 2 + 1 ; E2], and (c) 1810.8 keV [2+ 2 → 2 + 1 ; M1+ E2]. tioned approximation methods. The r… view at source ↗
Figure 9
Figure 9. Figure 9: (a) Calculated cross sections obtained using CoH [PITH_FULL_IMAGE:figures/full_fig_p013_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Cross sections for the 56Fe(n, p) reaction: cal￾culated using CoH3 (solid magenta curve) and taken from the MF=3 MT=103 file from the ENDF/B-VIII.0 library (dashed black line). and hσ ENDF np i = 0.47 mb, hence, in close agreement. These results are statistically insignificant in com￾parison to the flux-weighted cross sections from the (n, n0γ) channel, hσ CoH np i is less than 0.3% that of hσγi, and no f… view at source ↗
Figure 11
Figure 11. Figure 11: (a) The solid cyan curve describes the overall fit to the sampled IRT-M data [7] embodied by Eq. (4). The dashed [PITH_FULL_IMAGE:figures/full_fig_p016_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Example of a SQLite transaction using condi [PITH_FULL_IMAGE:figures/full_fig_p018_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Absolute partial γ-ray cross sections for the 110Pd(n, n0γ) reaction extracted from the Baghdad Atlas database using the Python Notebook automation methods. the SQLite libraries. One of the main advantages of creating Jupyter Notebook projects is that it greatly enhances and facilitates project sharing among re￾searchers, allowing users to create collaborative and reproducible narratives. Although this me… view at source ↗
read the original abstract

A relational database has been developed based on the original ($n,n'\gamma$) work carried out by A. M. Demidov $et$ $al$., at the Nuclear Research Institute in Baghdad, Iraq [$"Atlas$ $of$ $Gamma$-$Ray$ $Spectra$ $from$ $the$ $Inelastic$ $Scattering$ $of$ $Reactor$ $Fast$ $Neutrons"$, Nuclear Research Institute, Baghdad, Iraq (Moscow, Atomizdat 1978)] for 105 independent measurements comprising 76 elemental samples of natural composition and 29 isotopically-enriched samples. The information from this Atlas includes: $\gamma$-ray energies and relative intensities; nuclide and level data corresponding to the residual nucleus and meta data associated with the target sample that allows for the extraction of the flux-weighted ($n,n'\gamma$) cross sections for a given transition relative to a defined value. The optimized angular-distribution-corrected fast-neutron flux-weighted partial $\gamma$-ray cross section for the production of the 846.8-keV $2^{+}_{1} \rightarrow 0^{+}_{\rm gs}$ $\gamma$-ray transition in $^{56}$Fe, determined to be $\langle \sigma_{\gamma} \rangle = 143(29)$ mb, is used for this purpose. However, different values for the adopted cross section can be readily implemented to accommodate user preference based on revised determinations of this quantity. The Atlas ($n,n'\gamma$) data has been compiled into a series of CSV-style ASCII data sets and a suite of Python scripts have been developed to build and install the database locally. The database can then be accessed directly through the SQLite engine, or using alternative methods such as the Jupyter Notebook Python-browser interface. Several examples exploiting different interaction methodologies are distributed with the complete software package.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 1 minor

Summary. The paper describes the development of a relational database (CSV files + Python/SQLite build scripts and Jupyter interface) transcribed from the 1978 Demidov et al. Atlas of (n,n'γ) spectra. It covers 105 measurements on 76 natural-composition and 29 isotopically enriched samples, encoding γ-ray energies/intensities, residual-nuclide level data, and target metadata that permit extraction of flux-weighted partial γ-ray cross sections relative to an external reference value (the 846.8 keV 2+→0+ transition in 56Fe, adopted as 143(29) mb but explicitly user-replaceable). No new measurements, fits, or model predictions are performed.

Significance. If the transcription is faithful, the packaged database supplies a practical, queryable resource for nuclear-data users who need legacy (n,n'γ) intensities and relative cross sections. The open build scripts, SQLite accessibility, and replaceable reference cross section are concrete strengths that support reproducibility and future updates without requiring re-derivation inside the manuscript.

minor comments (1)
  1. [Abstract] The abstract and §1 refer to the adopted 56Fe reference cross section as 'optimized angular-distribution-corrected'; a brief sentence clarifying that this value is taken directly from external literature (and is not re-derived here) would remove any possible ambiguity for readers.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript, the recognition of its practical utility for nuclear-data users, and the recommendation to accept.

Circularity Check

0 steps flagged

No significant circularity; database is transcription of external data

full rationale

The paper presents a relational database compiled from the 1978 Demidov et al. Atlas measurements for (n,n'γ) reactions. No derivations, predictions, model fits, or first-principles results are claimed or performed. The reference cross section ⟨σγ⟩=143(29) mb for 56Fe is adopted from external sources and explicitly noted as replaceable by users. All content reduces to faithful transcription plus metadata enabling relative cross-section extraction; no step reduces by construction to its own inputs or self-citation chains. This is a standard data-compilation effort with no load-bearing circular elements.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The paper rests on faithful transcription of the 1978 source and the suitability of the adopted iron reference value; no new entities or fitted parameters are introduced by the authors themselves.

free parameters (1)
  • reference cross section for 56Fe 846.8 keV transition = 143(29) mb
    Adopted normalization value of 143(29) mb taken from prior literature; software permits substitution but the paper supplies this specific number.
axioms (1)
  • domain assumption The 1978 Demidov et al. Atlas correctly records gamma-ray energies, relative intensities, nuclide identifications, and level data for the listed samples.
    Database construction assumes the source publication is error-free and complete for the 105 measurements described.

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