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arxiv: 2210.07625 · v6 · submitted 2022-10-14 · ⚛️ physics.ins-det · hep-ex

Measurement of the scintillation resolution in liquid xenon and its impact for future segmented calorimeters

C. Romo-Luque , N. Salor-Igui\~niz , J. M. Benlloch-Rodr\'iguez , R. Esteve , V. Herrero-Bosch , R. J. Aliaga , V. \'Alvarez , F. Ballester
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R. Gadea A. Mart\'inez F. Monrabal M. Querol J. Rodr\'iguez J. Rodr\'iguez-Ponce S. Teruel-Pardo J. F. Toledo R. Torres-Curado P. Ferrario J. J. G\'omez-Cadenas
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Pith reviewed 2026-05-24 11:20 UTC · model grok-4.3

classification ⚛️ physics.ins-det hep-ex
keywords liquid xenonscintillationenergy resolutionsilicon photomultiplierspositron emission tomographysegmented calorimetersintrinsic resolution
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The pith

Liquid xenon scintillation achieves 3.7% energy resolution at 511 keV after saturation correction.

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

The paper measures the energy resolution from scintillation light alone in liquid xenon using an optimized setup with high-PDE VUV-sensitive silicon photomultipliers. It reports 3.7 ± 0.4% resolution at 511 keV once saturation is corrected, which approaches the calculated Poissonian statistical limit of 2.8 ± 0.4%. The extracted intrinsic resolution of 2.3 ± 0.8% remains compatible within uncertainties with the 1.8% value predicted by theory for two decades. This performance indicates that modular scintillation detectors based on liquid xenon can function as viable elements in segmented calorimeters for applications such as positron emission tomography.

Core claim

The central claim is that liquid xenon, when read out solely via scintillation light in a light-collection-optimized setup, delivers a saturation-corrected energy resolution of 3.7 ± 0.4% at 511 keV that lies close to the Poissonian expectation of 2.8 ± 0.4%, while the intrinsic resolution component of 2.3 ± 0.8% agrees with the longstanding theoretical estimate of 1.8%.

What carries the argument

The light-collection-optimized detector using VUV-sensitive SiPMs together with saturation-effect corrections applied to the scintillation signals.

If this is right

  • Modular liquid-xenon scintillation detectors become competitive building blocks for segmented calorimeters.
  • Scintillation-only readout in liquid xenon opens practical designs for positron emission tomography systems.
  • Energy resolution near the statistical limit reduces the need for additional charge readout in xenon-based detectors.

Where Pith is reading between the lines

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

  • Similar resolution measurements at higher energies could test whether the intrinsic component remains constant or scales with energy.
  • The result invites direct comparison of scintillation-only xenon modules against hybrid charge-plus-light systems in the same calorimeter geometry.

Load-bearing premise

The setup truly maximizes light collection so that the calculated Poissonian limit of 2.8% accurately reflects the number of detected photons.

What would settle it

A repeat measurement at 511 keV that yields a saturation-corrected resolution substantially larger than 3.7% while using the same light-collection geometry and SiPMs would falsify the reported performance.

Figures

Figures reproduced from arXiv: 2210.07625 by A. Mart\'inez, C. Romo-Luque, F. Ballester, F. Monrabal, J. F. Toledo, J. J. G\'omez-Cadenas, J. M. Benlloch-Rodr\'iguez, J. Rodr\'iguez, J. Rodr\'iguez-Ponce, M. Querol, N. Salor-Igui\~niz, P. Ferrario, R. Esteve, R. Gadea, R. J. Aliaga, R. Torres-Curado, S. Teruel-Pardo, V. \'Alvarez, V. Herrero-Bosch.

Figure 1
Figure 1. Figure 1: FIG. 1. A schematic illustrating the concept of SSB. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. A schematic view of our experimental setup (not to [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. The aluminum cube holding the two SSBs used for [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Top: instrumented plane of four arrays of 4 [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Distribution of the charge detected by one of the [PITH_FULL_IMAGE:figures/full_fig_p005_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Distribution of the resolution measured in each cell [PITH_FULL_IMAGE:figures/full_fig_p005_7.png] view at source ↗
read the original abstract

We report on a new measurement of the energy resolution that can be attained in liquid xenon when recording only the scintillation light. Our setup is optimized to maximize light collection, and uses state-of-the-art, high-PDE, VUV-sensitive silicon photomultipliers. We find a value of 3.7 $\pm$ 0.4% at 511 keV, once saturation effects are corrected for, a result close to the Poissonian resolution that we expect in our setup (2.8 $\pm$ 0.4% $\sigma$ at 511 keV). Our results in the intrinsic resolution (2.3 $\pm$ 0.8 %) are compatible, within errors, at 511 keV, with those found by theoretical estimations which have been standing for the last twenty years, 1.8%. Our work opens new possibilities for apparatus based on liquid xenon and using scintillation only. In particular it suggests that modular scintillation detectors using liquid xenon can be very competitive as building blocks in segmented calorimeters, with applications to Positron Emission Tomography technology.

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 manuscript reports an experimental measurement of the scintillation energy resolution in liquid xenon using an optimized setup with high-PDE VUV-sensitive SiPMs. After applying a saturation correction, the total resolution is found to be 3.7 ± 0.4% at 511 keV, stated to be close to the Poissonian expectation of 2.8 ± 0.4%. An intrinsic resolution of 2.3 ± 0.8% is extracted and reported as compatible within errors with long-standing theoretical estimates of 1.8%. The work concludes that scintillation-only LXe detectors can be competitive building blocks for segmented calorimeters, with potential PET applications.

Significance. If the measurement and its comparison to the Poisson limit hold after verification of the analysis chain, the result would be significant for noble-liquid detector development. It supplies the first direct experimental test in a maximized-light-collection configuration that the resolution can approach the statistical floor, lending support to theoretical intrinsic-resolution predictions that have stood for two decades without experimental confrontation. This strengthens the case for modular LXe scintillation detectors in medical imaging and particle-physics calorimetry.

major comments (2)
  1. [Abstract / Results (saturation correction)] Abstract and saturation-correction paragraph in Results: Both the reported 3.7 ± 0.4% resolution and the 2.8 ± 0.4% Poisson expectation are obtained only after the same saturation correction is applied to determine the number of detected photons. Because an error in the correction parameters (PDE, cross-talk, recovery time) shifts both quantities in the same direction, the claim that the measured value is “close to the Poissonian resolution” is not independent of the correction model. The functional form of the correction and the numerical values adopted for its parameters must be stated explicitly so that the robustness of the comparison can be assessed.
  2. [Results (intrinsic resolution extraction)] Section describing extraction of intrinsic resolution: The intrinsic resolution is quoted as 2.3 ± 0.8% and declared compatible with the 1.8% theoretical value, yet the procedure used to isolate the intrinsic component (quadratic subtraction, direct fit, or other) and the propagation of uncertainties that yields the ±0.8% error are not specified. Without this information the compatibility statement cannot be evaluated quantitatively.
minor comments (2)
  1. [Abstract] The abstract writes “2.8 ± 0.4% σ”; the notation is slightly redundant. Consider “2.8 ± 0.4% (σ)” for clarity.
  2. [Introduction] The specific references supporting the “theoretical estimations … 1.8%” that have stood for twenty years should be cited explicitly in the introduction or discussion.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the positive assessment of the significance of our work and for the constructive comments. We address each major comment below and will revise the manuscript to incorporate the requested clarifications on the analysis methods.

read point-by-point responses

  1. Referee: [Abstract / Results (saturation correction)] Abstract and saturation-correction paragraph in Results: Both the reported 3.7 ± 0.4% resolution and the 2.8 ± 0.4% Poisson expectation are obtained only after the same saturation correction is applied to determine the number of detected photons. Because an error in the correction parameters (PDE, cross-talk, recovery time) shifts both quantities in the same direction, the claim that the measured value is “close to the Poissonian resolution” is not independent of the correction model. The functional form of the correction and the numerical values adopted for its parameters must be stated explicitly so that the robustness of the comparison can be assessed.

    Authors: We agree that explicit documentation of the saturation correction is necessary to allow independent evaluation of the comparison. In the revised manuscript we will add a dedicated subsection (or expand the existing paragraph) that states the functional form of the correction (a standard model accounting for SiPM saturation, cross-talk, and afterpulsing) together with the numerical values adopted for PDE, cross-talk probability, and recovery time. This will enable readers to test the sensitivity of both the measured resolution and the Poisson expectation to variations in these parameters. revision: yes

  2. Referee: [Results (intrinsic resolution extraction)] Section describing extraction of intrinsic resolution: The intrinsic resolution is quoted as 2.3 ± 0.8% and declared compatible with the 1.8% theoretical value, yet the procedure used to isolate the intrinsic component (quadratic subtraction, direct fit, or other) and the propagation of uncertainties that yields the ±0.8% error are not specified. Without this information the compatibility statement cannot be evaluated quantitatively.

    Authors: We acknowledge that the extraction procedure and uncertainty propagation were not described with sufficient detail. The intrinsic resolution was isolated via quadratic subtraction, σ_intrinsic = √(σ_total² − σ_Poisson²), with the quoted uncertainty obtained by standard Gaussian error propagation that includes the uncertainties on both the total and Poisson terms. In the revised manuscript we will insert a short paragraph (or subsection) in the Results section that explicitly states this method and the propagation formula, allowing quantitative assessment of the compatibility with the 1.8% theoretical value. revision: yes

Circularity Check

0 steps flagged

No significant circularity in direct experimental measurement

full rationale

This paper reports a direct experimental measurement of scintillation energy resolution in liquid xenon using optimized SiPM light collection. The reported 3.7% resolution (after saturation correction) and the 2.8% Poisson expectation are both derived from the same dataset, but the Poisson limit is the standard statistical floor 1/sqrt(N) computed from the mean photoelectron count; the measured width is the observed distribution width. Subtracting to obtain the 2.3% intrinsic resolution follows the conventional quadrature procedure and does not reduce any claimed result to a self-defined quantity or a fitted parameter renamed as a prediction. No derivation chain, self-citation load-bearing step, or ansatz is present. The work is self-contained against external benchmarks (prior theoretical estimates of 1.8%) and does not invoke any of the enumerated circularity patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard assumptions in scintillation detector physics: Poisson statistics for photon counting, accurate saturation modeling in SiPMs, and the validity of the 20-year-old theoretical intrinsic resolution estimate. No free parameters or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption Theoretical intrinsic resolution in liquid xenon is 1.8% at 511 keV
    Compatibility is claimed with estimations standing for the last twenty years.

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Reference graph

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