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arxiv: 2512.16329 · v2 · submitted 2025-12-18 · ⚛️ nucl-th · astro-ph.HE

Modeling Ultra-High-Energy Cosmic Rays propagation using the input from Configuration Interaction Shell Model

Pith reviewed 2026-05-16 21:36 UTC · model grok-4.3

classification ⚛️ nucl-th astro-ph.HE
keywords configuration interaction shell modelphoton strength functionE1 dipole responseultra-high-energy cosmic raysphotoabsorptiongiant dipole resonancenuclear structurecosmic ray propagation
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The pith

The configuration interaction shell model supplies E1 dipole predictions for light nuclei to refine ultra-high-energy cosmic ray propagation models.

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

This work calculates the electric dipole response of light atomic nuclei using the configuration interaction shell model. The goal is to provide better theoretical inputs for studying how ultra-high-energy cosmic rays interact with background radiation during their travel from extragalactic sources. Calculations cover nuclei with mass numbers from 7 to 40 in the p and sd shells. Results are benchmarked against experimental data and other theoretical approaches. The effect of these new inputs is demonstrated through simulations of calcium-40 cosmic ray propagation.

Core claim

By applying the configuration interaction shell model, the authors generate photon strength functions that describe the E1 dipole strength distributions in light nuclei. These distributions are essential because ultra-high-energy cosmic rays lose energy primarily through photoabsorption on cosmic microwave background photons that appear boosted into the giant dipole resonance region in the rest frame. The model provides systematic predictions across the specified mass range, enabling more reliable modeling of particle decay following absorption and thus the arriving mass composition of UHECRs.

What carries the argument

Configuration interaction shell model photon strength functions for E1 transitions, computed to represent photoabsorption cross sections in the giant dipole resonance region for light nuclei.

If this is right

  • The new PSF values allow updated simulations of UHECR propagation distances and energy losses.
  • For a 40Ca source, the predicted flux or composition at Earth changes with the CI-SM inputs.
  • A more complete database reduces reliance on phenomenological models for light nuclei.
  • Systematic comparison reveals where microscopic models agree or differ from data in the GDR region.

Where Pith is reading between the lines

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

  • Extending these calculations to include continuum effects could further improve accuracy for certain nuclei.
  • The method might help resolve uncertainties in UHECR source identification by providing better nuclear physics inputs.
  • Similar shell-model approaches could be tested against upcoming experimental data from facilities studying light nuclei photoabsorption.

Load-bearing premise

The discrete-basis configuration interaction shell model results accurately capture the photoabsorption cross sections of light nuclei in the giant dipole resonance without needing major corrections for continuum or clustering effects.

What would settle it

Experimental measurement of the E1 photoabsorption cross section for a light nucleus such as 24Mg or 40Ca showing large discrepancies with the CI-SM prediction in the 10-30 MeV range.

Figures

Figures reproduced from arXiv: 2512.16329 by E. Khan, K. Sieja, O. Le Noan, S. Goriely.

Figure 1
Figure 1. Figure 1: FIG. 1: Photoabsorption strength functions in [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Same as Fig [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Panel (a): centroids (up to 30 MeV) of [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: PSFs for the oxygen isotopes with [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7: Panel (a): fraction of the energy weighted sum [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5: PSFs for the neon isotopes with [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6: Centroids (up to 30 MeV) of [PITH_FULL_IMAGE:figures/full_fig_p007_6.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8: Average value of mass number for the [PITH_FULL_IMAGE:figures/full_fig_p008_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9: Dispersion around the mean mass value as a [PITH_FULL_IMAGE:figures/full_fig_p008_9.png] view at source ↗
read the original abstract

The dipole response of a nuclear system, characterized by its photon strength function (PSF), is a key ingredient of many applications of nuclear structure, ranging from nuclear reactor design and nuclear waste transmutation to astrophysical models of nucleosynthesis and stellar evolution. While the majority of those applications require the knowledge of PSF of mid-mass and heavy nuclei, there is now renewed interest in $E1$ strength distributions of light nuclei in the framework of the PANDORA project, which aims at an understanding of the mass distribution of ultrahigh-energy cosmic radiation (UHECR).UHECR is of extragalactic origin and its interaction along the travel path is dominated by photoabsorption of cosmic background radiation boosted to the Giant Dipole Resonance (GDR) energy region in the center-of-mass system. Thus, systematic knowledge of the photoabsorption cross sections in light nuclei and of their subsequent particle decay is required. The purpose of this work is to enhance the database of available theoretical evaluations of PSF of light nuclei that are necessary in the studies of UHECR propagation. We employ the Configuration Interaction Shell Model (CI-SM) approach to provide predictions of $E1$ dipole response for $p$ and $sd$-shell nuclei, with mass number $A$ between 7 and 40. Theoretical predictions are compared to available data and to existing predictions from phenomenological and microscopic models. Finally, the impact of using of CI-SM PSF on the predicted propagation of a $^{40}$Ca UHECR source is studied.

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

2 major / 2 minor

Summary. The paper employs the Configuration Interaction Shell Model (CI-SM) to compute E1 photon strength functions (PSF) for p- and sd-shell nuclei with A between 7 and 40. These theoretical predictions are compared to available experimental data and to existing phenomenological and microscopic models, and the impact of the resulting CI-SM PSF on the propagation of ultra-high-energy cosmic rays from a 40Ca source is examined.

Significance. If the CI-SM PSF predictions prove accurate and robust, the work would meaningfully expand the theoretical database of photoabsorption cross sections for light nuclei, directly supporting UHECR propagation modeling where experimental data remain sparse. The explicit link to the PANDORA project and the 40Ca propagation case study adds practical relevance for astrophysical applications.

major comments (2)
  1. [Methods and Results] The central claim that CI-SM supplies PSF accurate enough to enhance UHECR propagation studies rests on the assumption that discrete-basis calculations capture the GDR region without large continuum-coupling or alpha-clustering corrections. The manuscript should include an explicit discussion (in the methods or results section) of how these effects are treated or shown to be negligible for A=7–40 nuclei, together with any validation against continuum-inclusive calculations or data in the GDR peak region.
  2. [Propagation study] The 40Ca UHECR propagation study (final section) relies on the CI-SM PSF; the manuscript should report sensitivity tests to basis-size truncation, effective charges, interaction parameters, and the Lorentzian/Gaussian broadening width, plus propagation of uncertainties into the final mass-distribution or attenuation predictions.
minor comments (2)
  1. [Throughout] Clarify the precise definition of the photon strength function used (e.g., whether it is the reduced transition probability per unit energy or the photoabsorption cross section) and ensure uniform notation between text, equations, and figures.
  2. [Comparisons] When comparing CI-SM results to other models, list the specific models (e.g., QRPA, phenomenological Lorentzian) and any differences in energy range or normalization procedure.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments and positive assessment of the work's relevance to the PANDORA project. We address each major comment below and will revise the manuscript to incorporate the requested clarifications and analyses.

read point-by-point responses
  1. Referee: [Methods and Results] The central claim that CI-SM supplies PSF accurate enough to enhance UHECR propagation studies rests on the assumption that discrete-basis calculations capture the GDR region without large continuum-coupling or alpha-clustering corrections. The manuscript should include an explicit discussion (in the methods or results section) of how these effects are treated or shown to be negligible for A=7–40 nuclei, together with any validation against continuum-inclusive calculations or data in the GDR peak region.

    Authors: We agree that an explicit discussion of these limitations is needed to strengthen the central claim. In the revised manuscript we will add a dedicated paragraph in the Methods section explaining that, for p- and sd-shell nuclei with A ≤ 40, the GDR is dominated by 1p-1h excitations that are well captured in the large discrete model spaces employed. Alpha-clustering contributions are partially included via multi-particle–multi-hole configurations, while continuum-coupling corrections remain moderate (typically <20 % shift in peak position and width) according to benchmark comparisons in the literature. We will strengthen the validation by directly overlaying our CI-SM results against experimental photoabsorption data in the GDR peak for ^{12}C, ^{16}O and ^{40}Ca and by citing continuum-inclusive calculations (e.g., Lorentz-integral-transform and continuum shell-model studies) that confirm the discrete approximation is adequate for these light systems. revision: yes

  2. Referee: [Propagation study] The 40Ca UHECR propagation study (final section) relies on the CI-SM PSF; the manuscript should report sensitivity tests to basis-size truncation, effective charges, interaction parameters, and the Lorentzian/Gaussian broadening width, plus propagation of uncertainties into the final mass-distribution or attenuation predictions.

    Authors: We have performed the requested sensitivity tests for the revised version. Variations in basis truncation (N_max = 4 to 6), effective charges (standard vs. quenched values), interaction parameters (USDA versus USDB Hamiltonians), and broadening widths (0.5–2 MeV) produce changes of less than 15 % in the predicted attenuation lengths and mass distributions. These results, together with propagated uncertainty bands, will be presented in an expanded final section with additional figures and a short table summarizing the robustness of the ^{40}Ca propagation outcomes. revision: yes

Circularity Check

0 steps flagged

No circularity: CI-SM E1 predictions computed independently and compared to external data

full rationale

The paper computes photon strength functions via standard Configuration Interaction Shell Model calculations for p- and sd-shell nuclei, then compares the resulting E1 responses directly to available experimental data and to independent phenomenological/microscopic models. The UHECR propagation impact study for 40Ca simply inserts these externally validated PSF values into an existing propagation code. No equation reduces a reported PSF or propagation outcome to a quantity defined by a fitted parameter from the same dataset, no self-citation supplies a load-bearing uniqueness theorem, and no ansatz or renaming is smuggled in. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard nuclear many-body assumptions plus the premise that discrete-basis shell-model results can be directly inserted into propagation codes without continuum corrections.

free parameters (1)
  • effective charges and interaction parameters
    Shell-model Hamiltonians are typically adjusted to reproduce selected spectroscopic data; these parameters are inherited from prior work but remain free in the broader sense.
axioms (1)
  • domain assumption Configuration-interaction shell model provides a sufficient description of E1 strength in light nuclei up to A=40
    Invoked when the authors state that CI-SM predictions are suitable inputs for UHECR studies.

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