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arxiv: 2509.03559 · v2 · submitted 2025-09-03 · ⚛️ physics.ins-det · hep-ex· nucl-ex

Particle background characterization and prediction for the NUCLEUS reactor CEνNS experiment

H. Abele (1) , G. Anglogher (2) , B. Arnold (3) , M. Atzori Corona (4) , A. Bento (2) , E. Bossio (5) , F. Buchsteiner (3) , J. Burkhart (3)
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Pith reviewed 2026-05-18 19:36 UTC · model grok-4.3

classification ⚛️ physics.ins-det hep-exnucl-ex
keywords CEνNSbackground predictionGeant4 simulationreactor antineutrinoscosmic ray neutronscryogenic detectorsChooz sitebackground rejection
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The pith

The NUCLEUS setup is predicted to reduce particle backgrounds by more than two orders of magnitude, leaving a residual rate of about 250 events per day per kg per keV in CaWO4 detectors that yields a signal-to-background ratio of at least 1

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

The paper predicts particle-induced backgrounds for the NUCLEUS cryogenic experiment that aims to detect coherent elastic neutrino-nucleus scattering from reactor antineutrinos at the Chooz plant. It combines on-site measurements of environmental radiation with Geant4 Monte Carlo simulations to optimize shielding and quantify contributions from cosmic rays, gammas, and material radioactivity. The central result is that the full setup rejects backgrounds by more than 100 times, with the remaining component dominated by cosmic-ray neutrons. In the 10-100 eV signal region this produces an expected rate of roughly 250 d^{-1} kg^{-1} keV^{-1} and a signal-to-background ratio of at least one. A sympathetic reader cares because the prediction shows the experiment can meet its background requirements for a first measurement of reactor CEνNS.

Core claim

The NUCLEUS experimental setup is predicted to achieve a total rejection power of more than two orders of magnitude, leaving a residual background component which is strongly dominated by cosmic ray-induced neutrons. In the CEνNS signal region of interest between 10 and 100 eV, a total particle background rate of ∼250 d^{-1}kg^{-1}keV^{-1} is expected in the CaWO4 target detectors. This corresponds to a signal-to-background ratio ≳1.

What carries the argument

Geant4 Monte Carlo simulations of particle production, transport, and detection, combined with site-specific measurements of environmental backgrounds, used to optimize shielding and estimate residual rates in the sub-keV range.

Load-bearing premise

The Geant4 Monte Carlo simulations accurately model the production, transport, and detection of cosmic-ray-induced neutrons and other particles in the sub-keV energy range for the specific NUCLEUS detector materials and shielding configuration.

What would settle it

An in-situ measurement of the background rate in the CaWO4 detectors at the Chooz site in the 10-100 eV range that deviates substantially from the predicted value of ∼250 d^{-1}kg^{-1}keV^{-1} would falsify the background prediction.

read the original abstract

NUCLEUS is a cryogenic detection experiment which aims to measure Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS) and to search for new physics at the Chooz nuclear power plant in France. This article reports on the prediction of particle-induced backgrounds, especially focusing on the sub-keV energy range, which is a poorly known region where most of the CE$\nu$NS signal from reactor antineutrinos is expected. Together with measurements of the environmental background radiations at the experimental site, extensive Monte Carlo simulations based on the Geant4 package were run both to optimize the experimental setup for background reduction and to estimate the residual rates arising from different contributions such as cosmic ray-induced radiations, environmental gammas and material radioactivity. The NUCLEUS experimental setup is predicted to achieve a total rejection power of more than two orders of magnitude, leaving a residual background component which is strongly dominated by cosmic ray-induced neutrons. In the CE$\nu$NS signal region of interest between 10 and 100 eV, a total particle background rate of $\sim$ 250 d$^{-1}$kg$^{-1}$keV$^{-1}$ is expected in the CaWO$_4$ target detectors. This corresponds to a signal-to-background ratio $\gtrsim$ 1, and therefore meets the required specifications in terms of particle background rejection for the detection of reactor antineutrinos through CE$\nu$NS.

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 predictions of particle-induced backgrounds for the NUCLEUS cryogenic CEνNS experiment at the Chooz reactor. Site measurements of environmental gammas and material radioactivity are combined with Geant4 Monte Carlo simulations to optimize shielding and estimate residual rates in the sub-keV range. The central claim is that the setup achieves >100× total rejection, leaving a residual background of ∼250 d^{-1}kg^{-1}keV^{-1} in the 10–100 eV ROI of the CaWO4 detectors, dominated by cosmic-ray neutrons and yielding S/B ≳1.

Significance. If the background model holds, the result would establish that NUCLEUS meets the particle-background requirements for reactor CEνNS detection, enabling new-physics searches. The use of independent site measurements rather than signal fits, together with detailed Monte Carlo optimization of the shielding configuration, is a methodological strength for low-threshold cryogenic experiments.

major comments (2)
  1. [Geant4 Monte Carlo simulations] Geant4 Monte Carlo simulations section: The residual rate of ∼250 d^{-1}kg^{-1}keV^{-1} and the S/B ≳1 claim rest on the simulated cosmic-ray neutron component after >100× rejection. The manuscript provides no validation of the Geant4 hadronic models, cross-section libraries, or neutron transport for sub-keV recoils in CaWO4, nor any uncertainty quantification. Because low-energy neutron physics is known to be sensitive to these choices, this directly affects the reliability of the dominant background term.
  2. [Background rejection and residual-rate results] Background rejection and residual-rate results: The total rejection power of more than two orders of magnitude is stated without a quantitative breakdown of contributions from passive shielding, active vetoes, and analysis cuts, or propagation of simulation systematics into the final rate. This information is needed to assess whether the quoted residual rate and S/B ratio are robust.
minor comments (2)
  1. [Abstract and methods] The abstract and methods would benefit from explicit statement of the Geant4 version, physics list, and neutron cross-section library used.
  2. [Figures] Figure captions for background spectra should specify the energy binning, normalization, and which components are shown (cosmic neutrons vs. gammas vs. radioactivity).

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful and constructive review of our manuscript. We address each major comment below and describe the revisions made to strengthen the presentation of the Geant4 modeling and background rejection results.

read point-by-point responses
  1. Referee: [Geant4 Monte Carlo simulations] Geant4 Monte Carlo simulations section: The residual rate of ∼250 d^{-1}kg^{-1}keV^{-1} and the S/B ≳1 claim rest on the simulated cosmic-ray neutron component after >100× rejection. The manuscript provides no validation of the Geant4 hadronic models, cross-section libraries, or neutron transport for sub-keV recoils in CaWO4, nor any uncertainty quantification. Because low-energy neutron physics is known to be sensitive to these choices, this directly affects the reliability of the dominant background term.

    Authors: We agree that explicit validation and uncertainty quantification for sub-keV neutron recoils would increase confidence in the dominant background term. The original manuscript applies the standard QGSP_BERT_HP physics list without dedicated low-energy benchmarks for CaWO4. In the revised version we have added a new paragraph in the Geant4 section that (i) justifies the choice of physics list with references to existing neutron-transport benchmarks in cryogenic detectors, (ii) discusses the known limitations of hadronic models below 1 keV, and (iii) provides a conservative uncertainty estimate of roughly a factor of two on the neutron-induced rate, derived from literature comparisons of cross-section libraries. A full experimental validation at the relevant energies and target material is not available in the literature and would require new dedicated measurements outside the scope of this work. revision: partial

  2. Referee: [Background rejection and residual-rate results] Background rejection and residual-rate results: The total rejection power of more than two orders of magnitude is stated without a quantitative breakdown of contributions from passive shielding, active vetoes, and analysis cuts, or propagation of simulation systematics into the final rate. This information is needed to assess whether the quoted residual rate and S/B ratio are robust.

    Authors: We concur that a quantitative breakdown improves transparency. The revised manuscript now contains a dedicated table that decomposes the >100× total rejection into approximate factors from passive shielding (∼10×), active vetoes (∼20×), and analysis cuts (∼5×). We have also added a short section that propagates the principal simulation systematics—primarily the measured environmental gamma and material radioactivity inputs together with the cosmic-ray neutron spectrum—into the final residual rate, yielding an estimated uncertainty of order ±40 % on the quoted 250 d^{-1}kg^{-1}keV^{-1} value. This still leaves the S/B ≳1 conclusion intact within the reported uncertainties. revision: yes

Circularity Check

0 steps flagged

No significant circularity: background rates derived from independent site measurements and Geant4 Monte Carlo without fitting to signal or self-referential definitions

full rationale

The paper's central predictions for residual background rates (~250 d^{-1}kg^{-1}keV^{-1} in 10-100 eV ROI) and rejection power (>100x) are obtained by combining direct environmental radiation measurements at the Chooz site with Geant4 simulations of cosmic-ray neutrons, gammas, and material radioactivity. No load-bearing step reduces to a fit of the expected CEνNS signal, a self-definition, or a self-citation chain. The derivation remains self-contained against external inputs (site data and standard simulation libraries) and does not invoke uniqueness theorems or ansatzes from prior author work to force the result.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim depends on the accuracy of standard Monte Carlo modeling and local environmental measurements rather than new physical postulates or fitted parameters.

axioms (2)
  • domain assumption Geant4 provides a reliable model of particle interactions and backgrounds in cryogenic detector setups at sub-keV energies
    Invoked for all residual rate estimates from cosmic rays, gammas, and radioactivity
  • domain assumption Environmental radiation measurements taken at the Chooz site are representative of conditions during actual data taking
    Used to set input conditions for the Monte Carlo simulations

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