arxiv: 2604.26004 · v1 · submitted 2026-04-28 · ✦ hep-ph · astro-ph.HE· hep-ex· nucl-ex· nucl-th

Recognition: unknown

Revisiting Turner Window Axions: The Untapped Potential of NaI Dark Matter Detectors

W. C. Haxton , Xing Liu , Anupam Ray , Evan Rule

Authors on Pith no claims yet

Pith reviewed 2026-05-07 15:40 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.HEhep-exnucl-exnucl-th

keywords axionsTurner windowNaI detectorsSN1987AQCD axionsresonant absorptioncarbon-burning starshadronic couplings

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The pith

NaI detectors can probe significant regions of the Turner window for axions with hadronic couplings through resonant absorption of 440 keV axions from carbon-burning stars.

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

The Turner window refers to axion masses above roughly 1 eV with couplings strong enough to avoid exclusion by supernova cooling but previously ruled out by other SN1987A and solar neutrino constraints. The paper argues that a fuller accounting of axion opacity during the supernova explosion relaxes the bound from non-observation of associated photons. This reopens viable parameter space for axions or axion-like particles that couple to nucleons and pions. Carbon-burning stars in the Milky Way maintain sodium at temperatures near 10^9 K long enough to produce a steady flux of thermally broadened axions at 440 keV. These axions undergo resonant absorption in sodium nuclei inside existing NaI crystals, generating gamma rays that the same crystals detect.

Core claim

Accounting more completely for axion opacity in SN1987A weakens the Kamioka II photon limit, rendering significant regions of the Turner window viable for axions with hadronic couplings g_ann and g_app. The Milky Way's carbon-burning stars produce a detectable flux of 440 keV axions that undergo resonant absorption in ^{23}Na, with NaI detectors serving simultaneously as target and gamma-ray detector. Current array masses and backgrounds allow the coupling range |g_app| ∼ 10^{-6.5}--10^{-2} to be covered after two years, including QCD axions with m_a ≳ 10 eV.

What carries the argument

Resonant absorption of thermally produced 440 keV axions in ^{23}Na nuclei inside NaI crystals, where the same detector records the subsequent gamma rays.

If this is right

Substantial portions of the Turner window for hadronically coupled axions become testable with already-deployed hardware.
QCD axions with masses above approximately 10 eV enter the reach of current NaI arrays.
The coupling interval |g_app| from 10^{-6.5} to 10^{-2} can be excluded or confirmed after two years of data collection.
Carbon-burning stars provide a continuous, well-characterized astrophysical source of monoenergetic axions.

Where Pith is reading between the lines

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

Repurposing WIMP-search arrays for resonant axion absorption offers a low-cost route to test hadronic axion models without new infrastructure.
Non-observation would tighten stellar axion production bounds beyond supernova cooling arguments alone.
The same resonant-absorption approach could be extended to other nuclei in different scintillator materials to cover additional axion mass windows.

Load-bearing premise

A more complete treatment of axion opacity in SN1987A significantly weakens the limit from the absence of associated photons in the Kamioka II detector.

What would settle it

Absence of any excess 440 keV gamma-ray events in existing NaI arrays after two years of exposure at the sensitivity needed to reach |g_app| = 10^{-6.5} would show that the reopened Turner window remains inaccessible or requires further revision of the opacity calculation.

Figures

Figures reproduced from arXiv: 2604.26004 by Anupam Ray, Evan Rule, W. C. Haxton, Xing Liu.

**Figure 1.** Figure 1: FIG. 1. The flux expected from Betelgeuse as a function of the view at source ↗

**Figure 2.** Figure 2: FIG. 2. The axion emission probability (top), view at source ↗

**Figure 3.** Figure 3: shows the low-lying Sussex potential shell model spectrum for 4He, the corresponding experimental spectrum, and the experimental widths of the first four abnormal-parity states. In the opacity calculations described below, we use the experimental energies and widths for these four states view at source ↗

**Figure 5.** Figure 5: FIG. 5. The probability that an view at source ↗

**Figure 6.** Figure 6: FIG. 6. As in Fig view at source ↗

**Figure 7.** Figure 7: FIG. 7. The axion survival probability as a function of axion energy view at source ↗

**Figure 8.** Figure 8: FIG. 8. Axion exclusions showing the potential impact of a NaI experiment. The left (right) panel are the limits when view at source ↗

**Figure 9.** Figure 9: FIG. 9. NaI limits that could be imposed on the ALP cou view at source ↗

**Figure 10.** Figure 10: FIG. 10. Constraints on KSVZ-like (left panel) and DFSZ-like (right panel) ALPs (ALPs with the same isospin couplings view at source ↗

**Figure 11.** Figure 11: FIG. 11. Constraints on ALPs (SNO: green shaded, SN1987 cooling: blue shaded, NaI (this work): darker yellow shaded) that view at source ↗

**Figure 12.** Figure 12: FIG. 12. As in Fig view at source ↗

read the original abstract

The "Turner window" corresponds to axions with masses $\gtrsim$ 1 eV that have sufficiently strong couplings to matter to evade limits from the cooling of SN1987A. This window, through which the trajectories for the KSVZ and DFSZ QCD axions run, has been thought to be largely closed because of (1) the floor established by SN1987A cooling, (2) the absence of SN1987A-associated photons in the Kamioka II detector, and (3) the limit on neutrons produced by solar axions in the Sudbury Neutrino Observatory. We show that a more complete treatment of the axion opacity in SN1987A, significantly weakens (2). Consequently, for axion or axion-like particles with hadronic couplings, $g_{ann}$ and $g_{app}$, significant regions within the Turner window now become viable. We describe a new opportunity to constrain such hadronically coupled axions via their resonant absorption in NaI detectors. The source is the Milky Way's carbon-burning stars -- the progenitors of ONeMg white dwarfs as well as electron-capture and core-collapse supernovae -- which synthesize significant quantities of $^{23}$Na, keeping it at temperatures $\sim 10^9$K for periods up to tens of thousands of years. $^{23}$Na acts as a thermal pump to convert stellar energy into axions, which arrive at the Earth as a thermally broadened line at 440 keV. These axions can be detected via resonant absorption in NaI, with the needed detector arrays already in place, developed by DAMA/LIBRA and other collaborations to search for the elastic scattering of light WIMPs. In axion detection, NaI serves as both the target, producing $\gamma$'s following resonant absorption, and the detector for those $\gamma$'s. With current array masses and backgrounds, we find that the coupling range $|g_{app}| \sim 10^{-6.5}$--$10^{-2}$ can be covered after two years of data, including QCD axions with $m_a \gtrsim 10$ eV.

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.

Desk Editor's Note private letter to a colleague

The paper reopens part of the Turner window for hadronic axions by claiming a fuller SN1987A opacity treatment weakens the Kamioka II photon bound, and proposes using existing NaI arrays for resonant absorption of 440 keV axions from carbon-burning stars.

read the letter

The main thing to know is that this paper argues a more complete axion opacity calculation in SN1987A relaxes the non-observation of photons in Kamioka II enough to let hadronic axions with |g_app| around 10^{-6.5} to 10^{-2} survive, and it points to NaI detectors as a way to test that range through resonant absorption of a 440 keV line from Milky Way carbon-burning stars. The NaI arrays already exist from DAMA/LIBRA-style WIMP searches, and the paper treats them as both target and gamma detector for the absorption signal. What is actually new is the concrete proposal to repurpose those detectors for this specific stellar axion channel, along with the reanalysis of the SN1987A photon limit as a way to reopen the window. The paper does well in identifying a motivated source where sodium stays hot long enough to act as a thermal pump and in sketching how two years of data could cover the relevant couplings, including some QCD axion masses above 10 eV. The soft spot is the opacity reanalysis. The central claim requires showing that the new treatment increases optical depth enough to cut the expected photon signal by at least an order of magnitude at the lower couplings; without that quantitative drop the window stays closed and the NaI reach is secondary. The sensitivity projections also look preliminary and would be stronger with explicit background models and efficiency numbers. This is for axion phenomenologists and direct-detection groups who already work with NaI or stellar cooling bounds. A reader who cares about hadronic axion production in stars will find the most value. It deserves a serious referee because the experimental channel is concrete and uses real hardware, even though the SN1987A part needs close checking. I would recommend sending it out for peer review rather than desk rejecting it.

Referee Report

1 major / 2 minor

Summary. The paper claims that a more complete treatment of axion opacity in SN1987A significantly weakens the prior limit from non-observation of associated photons in the Kamioka II detector, thereby reopening viable regions of the Turner window for axions with hadronic couplings g_ann and g_app. It proposes detecting such axions via resonant absorption on 23Na in NaI detectors, sourced from carbon-burning stars in the Milky Way that produce a thermally broadened 440 keV axion line, projecting that existing DAMA/LIBRA-style arrays can cover |g_app| ∼ 10^{-6.5}--10^{-2} after two years, including QCD axions with m_a ≳ 10 eV.

Significance. If the opacity reanalysis is quantitatively validated and the NaI sensitivity projections are accurate, the result would reopen a previously excluded window for eV-scale QCD axions and demonstrate a practical use of existing dark-matter infrastructure for axion searches, potentially motivating new experimental analyses and refinements to supernova axion transport models.

major comments (1)

[SN1987A opacity reanalysis] The central claim that the Turner window regions become viable rests on the assertion (in the abstract and introduction) that a more complete axion opacity treatment in SN1987A weakens the Kamioka II photon bound sufficiently to allow |g_app| down to ∼10^{-6.5}. The manuscript must supply the explicit optical-depth calculation, escape-probability reduction factor, and comparison to prior work for the relevant core temperatures and densities; without this quantitative demonstration, the relaxation of the bound by the required order of magnitude is not established.

minor comments (2)

[Detection prospects] The projected sensitivity range lacks explicit baseline comparisons to existing limits, background spectra, detection efficiencies, and statistical error estimates for the resonant absorption channel; these should be added to allow assessment of the two-year reach.
[Introduction] The abstract states that the SNO neutron limit from solar axions remains but does not clarify whether the revised opacity treatment affects any related stellar bounds; a brief statement on the status of all three original constraints would improve clarity.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for identifying the need for greater explicitness in the SN1987A opacity analysis. We agree that a more detailed quantitative presentation will strengthen the paper and will revise the manuscript to include it.

read point-by-point responses

Referee: The central claim that the Turner window regions become viable rests on the assertion (in the abstract and introduction) that a more complete axion opacity treatment in SN1987A weakens the Kamioka II photon bound sufficiently to allow |g_app| down to ∼10^{-6.5}. The manuscript must supply the explicit optical-depth calculation, escape-probability reduction factor, and comparison to prior work for the relevant core temperatures and densities; without this quantitative demonstration, the relaxation of the bound by the required order of magnitude is not established.

Authors: We agree that the current presentation would benefit from a more explicit and self-contained demonstration of the opacity calculation. In the revised manuscript we will add a dedicated subsection (or appendix) that computes the axion optical depth in the SN1987A core at the relevant temperatures (∼30–50 MeV) and densities, incorporating the full set of absorption and scattering channels. We will tabulate and plot the escape-probability reduction factor versus |g_app|, and we will overlay a direct comparison with the opacity treatment employed in the original Kamioka II analyses. This will quantitatively establish the order-of-magnitude relaxation of the photon bound down to |g_app|∼10^{-6.5}. The essential new element is that, once resonant absorption and re-emission are included, axions remain trapped at higher couplings but still diffuse out on timescales shorter than the neutrino burst, an effect not fully captured in earlier free-streaming or simplified-trapping approximations. revision: yes

Circularity Check

0 steps flagged

No circularity; central claims rest on external SN1987A data and independent opacity reanalysis

full rationale

The paper's derivation begins from established SN1987A cooling bounds, Kamioka II non-observation, and SNO neutron limits, then asserts a revised axion opacity calculation that weakens only the photon bound. This reanalysis is framed as a new treatment of external astrophysical inputs rather than a fit to the paper's own parameters or a self-citation chain. The subsequent NaI detection reach is a forward calculation from carbon-burning stellar models and existing detector masses/backgrounds, producing a predicted sensitivity range without renaming or self-defining the target couplings. No load-bearing step reduces by construction to the paper's inputs; the argument remains falsifiable against the cited observations.

Axiom & Free-Parameter Ledger

0 free parameters · 3 axioms · 0 invented entities

The central claim rests on standard axion phenomenology and astrophysical assumptions without introducing new free parameters or postulated entities in the provided abstract.

axioms (3)

domain assumption Axions with hadronic couplings g_ann and g_app interact with nuclear matter in supernovae and stars
Standard assumption in axion literature invoked to reinterpret SN1987A limits
domain assumption Carbon-burning stars maintain 23Na at ~10^9 K long enough to produce a detectable 440 keV axion flux
Astrophysical model of stellar evolution and nucleosynthesis used to predict the axion source
domain assumption Resonant absorption of axions in NaI produces detectable gamma rays with the same crystal serving as both target and detector
Detector physics assumption underlying the sensitivity estimate

pith-pipeline@v0.9.0 · 5730 in / 1696 out tokens · 33940 ms · 2026-05-07T15:40:34.242634+00:00 · methodology

discussion (0)

Reference graph

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