{"id":"fe05e40f-0b19-4ba8-a8bc-3f9182b44809","arxiv_id":"2501.08127","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":4,"one_line_summary":"BEST-2 proposes a cobalt-58 neutrino source and a three-zone gallium target to measure sterile-neutrino oscillation parameters and test the energy dependence of the gallium anomaly.","lead":"A team proposes a new experiment, BEST-2, that will expose a large gallium detector to a cobalt-58 neutrino source to test whether the long-standing gallium anomaly is caused by neutrinos oscillating into a hidden sterile state. If built, it could directly measure the oscillation parameters and check whether the anomaly depends on neutrino energy.","discovery_kind":"extension","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The 3σ parameter-determination claim is not established by the sensitivity analysis: the D-ratio threshold in Section 12 is not the χ² contour used in Section 13, and no coverage scan shows that every claimed point yields a compact allowed region.","rationale":"I read the paper in good faith as a design study for a proposed experiment. The underlying scheme is internally consistent: the source activity estimate, event-rate budget, and three-zone geometry are plausible, and the authors are explicit that the headline claim is conditional on the true parameters lying in the sensitivity region. The reader's weakest assumption correctly identifies the fixed 7% error as a weak point, and I agree that this prevents full acceptance. My stress-test sharpens that concern: the load-bearing gap is not merely the numerical value of the error, but the logical step from the simplified D-ratio sensitivity map to the claim of 3σ parameter determination. The D statistic is a detection-style threshold, whereas the central claim is a parameter-estimation statement about bounded χ² contours. Showing one compact contour (Fig. 11) does not establish the claimed error for the whole region, especially given the acknowledged blind zones and the unbounded contours that appear just outside the region. A coverage scan would settle whether the claim holds. I do not see an internal inconsistency or a reason to reject the proposal; the concern is about the strength of the quantitative claim, so the reader's CONDITIONAL verdict remains the right one. I also note the 400 kCi source feasibility is an external risk, but it is not the most load-bearing issue for the central physics claim and can be checked separately by irradiating nickel in a fast reactor.","tokens_in":14988,"tokens_out":11001,"duration_ms":125754,"concrete_test":"Run a Monte Carlo coverage scan over the claimed sensitivity region: for each grid point (Δm², sin²2θ), simulate many pseudo-experiments with m=10 exposures, per-zone Poisson rates and solar background as in Table 1, and nuisance parameters for source activity and zone efficiencies; fit each with the Section 13 χ²; then verify that the 3σ allowed contour contains the true point with ≥99.7% coverage, is compact (no disconnected islands), has Δm² width within a factor of 2, and has sin²2θ width below about 0.2. Also redraw Fig. 10 using this full χ² covariance instead of the D>n×7% criterion; if any currently shaded region fails the compactness/coverage test, the headline claim should be revised.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim is conditional: if the true (Δm², sin²2θ) lies in the sensitivity region, BEST-2 will determine both parameters with errors of several tens of percent at 3σ. The only support for this is Section 12's sensitivity map, built from D(l,k) = max_{i<j}|R_i/R_j − 1| compared against a fixed 7% error, plus one illustrative χ² contour in Fig. 11. But D>3σ is not equivalent to a bounded, unique 3σ allowed region. The χ² analysis of Section 13 can in principle produce multiple islands or an unbounded tail even where the pairwise-ratio differences are large; the paper itself acknowledges blind zones near Δm² = 6 and 8 eV² and shows an unbounded allowed region just outside the claimed boundary in Fig. 12. In addition, the fixed 7% is not derived from the per-zone errors in Table 1 (3.8%, 5.6%, 5.8% for α=1), ignores the trials factor from taking the maximum of three pairwise ratios, and does not propagate the effect of oscillation-induced count suppression on the per-zone statistical errors. Systematic uncertainties in source activity, extraction efficiency, and cross-section are not folded into the contours shown in Figs. 11 and 12. Thus the quantitative 'several tens of percent at 3σ' statement is an extrapolation from a simplified detection threshold to a parameter-estimation claim, and it is not yet demonstrated for the entire claimed region.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"The paper proposes a new gallium-source experiment, BEST-2, using a 400 kCi 58Co neutrino source placed at the center of a three-zone gallium target. The stated goals are to test the gallium anomaly, to determine the sterile-neutrino oscillation parameters (Δm², sin²2θ) if they lie in the claimed sensitivity region (approximately Δm² from 0.5 to 5.5 eV²), and to search for an energy dependence of the gallium anomaly by comparing with previous 51Cr and 37Ar source experiments. The expected event rates are obtained from the standard survival probability, Monte Carlo path-length distributions for the three target zones, an assumed exposure schedule (m = 10 irradiations of t1 = 16 days), and published cross sections. Sensitivity regions in Section 12 are built from the maximum pairwise deviation of zone capture-rate ratios relative to a fixed 7% statistical error, with illustrative χ² allowed regions in Figs. 11 and 12. The paper also contains estimates of source production in fast-neutron reactors, heat release, and radiation safety.","tokens_in":15307,"tokens_out":4406,"duration_ms":47535,"significance":"If the sensitivity claim is validated, BEST-2 would be a valuable and distinctive experiment: it would use a monochromatic source at higher energy than previous gallium sources, and the three-zone layout could in principle reveal a distance-dependent oscillation pattern rather than only an overall rate deficit. The paper is useful as a design study: it gives concrete target geometry, exposure scheduling, source-production requirements, and a transparent discussion of blind zones and of the restrictive impact of PROSPECT data. The main quantitative claim, however, is not yet established at the level asserted in the abstract and conclusion, because the sensitivity criterion of Section 12 is not equivalent to the parameter-estimation criterion of Section 13, and because the fixed 7% error assumption is not derived from the per-zone errors in Table 1 or from a full error budget. The experiment's practical discovery potential is also substantially reduced by the PROSPECT exclusions shown in Fig. 10, a point the paper acknowledges but does not quantify.","major_comments":[{"comment":"The central claim that oscillation parameters will be determined with errors of several tens of percent at 3σ is not supported by the sensitivity criterion used in Section 12. The sensitivity regions are defined by D(l,k) = max_{i<j}|R_i/R_j − 1| compared with a fixed σ = 7%, while the parameter-determination claim is illustrated in Figs. 11 and 12 with the χ² contours of Section 13. These are different statistics: D > 3σ for a grid point does not imply that the 3σ allowed region is a single compact set containing the true point. Indeed, Fig. 12 shows an unbounded allowed region immediately outside the claimed sensitivity boundary, and the text itself identifies blind zones near Δm² = 6 and 8 eV². The authors should provide a coverage-style simulation: for a grid of true (Δm², sin²2θ) inside the claimed region, generate measured rates with realistic per-zone statistical errors, compute the Section 13 χ² contours, and demonstrate that the 3σ region is compact, contains the true values, and yields parameter uncertainties of several tens of percent. Without such a check, the quoted precision is an extrapolation from a detection threshold to a parameter-estimation statement.","section":"Section 12 and Section 13"},{"comment":"The fixed 7% statistical error is asserted rather than derived. Table 1 gives per-zone relative statistical errors of 3.8%, 5.6%, and 5.8% for α = 1, and the maximum over three pairwise ratios introduces a trials factor that is not discussed. In addition, oscillation-induced suppression changes the number of events in each zone and therefore changes the per-zone statistical errors themselves, an effect the fixed-σ approximation ignores. The text states that the simplification has \"virtually no effect\" on the sensitivity boundaries, but no quantitative comparison is shown. The authors should propagate the actual statistical errors, the trials factor, and the principal systematic uncertainties (source activity, extraction efficiency, 71Ge counting efficiency, 60Co contamination, cross-section uncertainty) into the sensitivity contours and show how the claimed 3σ boundary changes. This is load-bearing because the sensitivity region is the basis for the paper's main conclusion.","section":"Section 12, Table 1"},{"comment":"The χ² function in Section 13 includes a covariance matrix V with \"statistical and systematic, including uncorrelated, experimental errors,\" but the numerical content of V is never specified, and the example contours in Figs. 11 and 12 do not state which systematic terms were included. Since the paper's headline claim is a quantitative 3σ parameter-determination precision, the error model used to produce these figures must be documented: the values of all uncorrelated systematic uncertainties, how they enter V, and how they affect the size and shape of the allowed regions. As written, the examples do not demonstrate that the claimed precision survives a realistic error budget.","section":"Section 13, Figs. 11 and 12"},{"comment":"The paper acknowledges that PROSPECT data \"almost completely exclude\" the region to which BEST-2 is sensitive, yet the abstract and introduction present the experiment as able to determine sterile oscillation parameters in a wide range. Because the central claim is explicitly conditional on the true parameters lying inside the sensitivity region, the practical import depends on how much of that region remains allowed after existing constraints. The authors should quantify the overlap between the claimed sensitivity region and the currently allowed parameter space (including the T2K-allowed region and the IceCube region) and state clearly what BEST-2 can uniquely test. If the overlap is small, the primary framing should be revised to emphasize the energy-dependence test of the gallium anomaly and the confirmation of the anomaly itself, rather than broad sterile-parameter determination.","section":"Section 12, Fig. 10"}],"minor_comments":[{"comment":"The sentence \"The article was accepted in the JETP\" is extraneous in the manuscript text and should be removed or moved to a footnote.","section":"Section 1"},{"comment":"Equation (1) and its surrounding text appear with garbled or overlapping characters in the manuscript; the survival probability should be typeset cleanly and all symbols (E, L, Δm², θ) defined in the text.","section":"Section 3, Eq. (1)"},{"comment":"The cross-section uncertainty \"(1.0 +0.17 -0.07)\" is unclear; it should be stated explicitly as a fractional uncertainty on σ = 253×10⁻⁴⁶ cm², with the reference to Bahcall's evaluation.","section":"Section 5"},{"comment":"The phrase \"For nickel enriched in isotope 68\" should read \"enriched in ⁵⁸Ni,\" and the abundance and mass numbers in that paragraph should be checked for consistency.","section":"Section 10"},{"comment":"The exclusion and allowed contours from PROSPECT, KATRIN, T2K, and IceCube are shown or mentioned without specifying the confidence level and oscillation channel used for each; the figure caption and text should provide this information.","section":"Section 12, Fig. 10"},{"comment":"The entries n_i in Table 2 are expected mean counts, but the table and text do not state this explicitly or give uncertainties; clarify that these are expectation values for the stated exposure schedule.","section":"Table 2"}],"recommendation":"major_revision","confidential_remarks":"The paper is a design/sensitivity study rather than a measurement paper, and its main quantitative claim is currently supported by a simplified detection threshold rather than a full parameter-reconstruction study. The requested coverage simulation and error-budget propagation are within the scope of a revision and would materially strengthen the paper. The authors should also confront the tension between the abstract's broad claim and the admitted near-complete exclusion by PROSPECT of the claimed sensitivity region; reframing the experiment's primary goal as a test of the gallium anomaly and its energy dependence may be more defensible than the current emphasis on sterile-parameter determination."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Plainly: this is a serious design study, not a measurement, and its headline sensitivity claim is overstated in a way that doesn't sink the proposal. The genuinely new piece is the combination of a 58Co source with a three-zone gallium target. That buys two things: a test of the gallium anomaly's energy dependence (1.5 MeV vs ~0.75 MeV) and a distance-dependent ratio pattern that could in principle pin down Δm², which BEST couldn't. The paper handles the standard pieces well: Monte Carlo capture-length distributions, a realistic 10-exposure schedule, Poisson error estimates with a solar-neutrino background term, and source production numbers that at least pass the sanity check. The radiation-safety and heat-release estimates are a plus.\n\nThe soft spots are where the stress-test puts them. The 'several tens of percent at 3σ' determination claim is built from a detection threshold—D(l,k) > 3σ with a fixed 7% per-zone error—and then one illustrative χ² contour. That threshold is not equivalent to a compact, unique 3σ allowed region, especially with three pairwise ratios and a max taken over them (trials factor). The paper states the simplification 'virtually' doesn't affect the boundaries but doesn't show it. It also doesn't fold source activity, cross-section, or extraction-efficiency systematics into the contours, and it ignores the fact that oscillation suppression changes the per-zone errors. The blind zones near Δm²=6 and 8 eV² and the unbounded regions in Fig. 12 are consistent with this. So I'd treat the sensitivity map as indicative, not as a certified parameter-estimation reach.\n\nThe more practical issue is Fig. 10: PROSPECT and T2K already exclude much of the claimed region. The paper acknowledges this but still frames the experiment as able to 'determine' parameters in that region. If the real world sits in the excluded part, BEST-2 becomes a confirmation/null experiment, not a measurement—still valuable, but not what the abstract promises. The source activity of 400 kCi is plausible but depends on unverified reactor irradiation assumptions.\n\nAll of this is fixable in a revision. The authors are transparent about what is assumed, and the physics is standard. This deserves serious refereeing, and I'd want the referee to ask for a coverage calculation and a systematic error budget before publication. For anyone working on the gallium anomaly, it's worth reading now.","headline":"A credible design study for a three-zone gallium experiment with a 58Co source; the headline 3σ parameter-determination claim overreaches, but the proposal is sound enough to referee.","tokens_in":15889,"tokens_out":2975,"would_cite":false,"duration_ms":29377,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"BEST-2, a proposed 400-kCi 58Co source inside a three-zone gallium target, claims to determine sterile-neutrino oscillation parameters (Δm², sin²2θ) to tens of percent at 3σ and to observe, for the first time, an oscillation pattern in…","keywords":["gallium anomaly","sterile neutrinos","cobalt-58 source","neutrino oscillations","three-zone gallium target","short-baseline oscillations","neutrino energy dependence","gallium source experiment"],"falsifier":"Run BEST-2 as proposed and compare the three zone rates after the ten exposures: if every pairwise ratio deviation is below 1σ (D(l,k) < 7%), the predicted few-many-few oscillation pattern is absent; alternatively, a total capture rate that differs from the previous gallium-experiment average by more than 2σ would disprove sterile oscillations as the main cause of the gallium anomaly.","tokens_in":14752,"feed_emoji":"⚛️","tokens_out":7775,"duration_ms":71026,"temperature":0.7,"pith_summary":"The paper proposes a new gallium-source experiment, BEST-2, to test the gallium anomaly — the persistent deficit of neutrino captures seen in calibration runs with intense artificial sources. The experiment places a 400-kCi 58Co neutrino source at the center of a gallium target split into three concentric zones and measures the capture rate in each zone separately. The central claim is that if short-baseline oscillations into sterile neutrinos exist with parameters in the sensitivity region (Δm² roughly 0.5–5.5 eV²), the experiment will determine both Δm² and sin²2θ with errors of several tens of percent at 3σ. Because 58Co emits nearly monoenergetic 1497 keV neutrinos, the three zone rates can reveal a distance-dependent oscillation pattern — a 'few-many-few' sequence — that no oscillation experiment has observed before. The same data also test whether the gallium anomaly depends on neutrino energy, since the cobalt neutrino energy is about twice that of previous chromium and argon sources.","feed_headline":"Three-zone gallium experiment would map sterile neutrino oscillations","feed_subtitle":"A 400-kCi cobalt-58 source and three concentric zones could pin down both oscillation parameters at 3σ.","key_machinery":"The load-bearing object is the three-zone gallium target with a common center: an inner sphere (average thickness ~52 cm) and two cylindrical shells (each ~27 cm thick), containing about 7.7, 14.7, and 26.8 tonnes of gallium. The 58Co source sits at the common center; its nearly monoenergetic 1497 keV neutrinos have a capture cross section of $253\\times 10^{-46}$ cm² on $^{71}$Ga, about 4.4 times larger than for $^{51}$Cr. For each zone the paper computes the distance distribution of captures by Monte Carlo, then forms expected rates under oscillations with survival probability $P_{ee}$ and works with ratios $R_i/R_j$; the sensitivity regions are defined by $D(l,k) = \\max_{i<j}|R_i/R_j - 1|$ compared with a fixed 7% statistical error for the outer zones. The 400-kCi source is produced by $(n,p)$ reactions on nickel in a fast-neutron reactor, giving about 891 events in the inner zone over ten 16-day exposures.","core_discovery":"The paper's core discovery claim is that dividing the gallium target into three independent concentric zones around a 58Co source turns the gallium anomaly from a single deficit number into a distance-resolved measurement. For monochromatic neutrinos, the survival probability $P_{ee} = 1 - \\sin^2 2\\theta\\,\\sin^2(1.27\\,\\Delta m^2 L/E)$ oscillates with distance $L$, and the ratios of capture rates in the three zones are sensitive to $\\Delta m^2$ in a continuous band from about 0.5 to 5.5 eV². The authors show by Monte Carlo zone-geometry and a $\\Delta\\chi^2$ analysis that if the true $(\\Delta m^2,\\sin^2 2\\theta)$ lies in this band, the allowed region is compact and both parameters are determined to tens of percent at 3σ; outside the band, allowed $\\Delta m^2$ values fragment into many disconnected ranges. They also claim this will be the first experiment to observe an actual oscillation curve of rate versus distance for fixed-energy neutrinos, and that a total rate differing by more than 2σ from previous gallium experiments would indicate an energy dependence incompatible with sterile oscillations as the main explanation.","pith_inferences":["My inference: since the paper's own Fig. 10 shows PROSPECT and T2K data already exclude a large part of the claimed sensitivity region, the most probable experimental outcome may be a null or inconclusive zone-ratio pattern; the durable value of BEST-2 could then lie in sharpening the gallium-anomaly deficit and testing its energy dependence rather than in determining oscillation parameters.","My inference: the fixed 7% outer-zone error should be replaced by a full Monte Carlo of the actual systematic budget — source activity calibration, extraction efficiencies per zone, 60Co contamination, and counter background — because the sensitivity-region boundaries in Fig. 10 are drawn from that single number.","My inference: the same three-zone distance-resolved design could be repeated with a second monoenergetic source of different energy (the paper discusses 65Zn) to disentangle energy dependence from distance dependence in the gallium anomaly without changing the target geometry."],"forward_implications":["If the oscillation hypothesis is right and the parameters lie in the sensitivity band, BEST-2 determines $\\Delta m^2$ and $\\sin^2 2\\theta$ with few-tens-of-percent errors at 3σ, including the usually hard-to-measure $\\Delta m^2$.","If the three-zone rates show the predicted few-many-few pattern, it would be the first direct observation of a neutrino oscillation periodicity in distance for fixed-energy neutrinos.","If the measured total capture rate differs by more than 2σ from previous gallium source experiments, the gallium anomaly depends on neutrino energy and sterile oscillations cannot be its main cause.","If the zone rates agree within errors, the experiment either rules out oscillations with $\\Delta m^2$ below about 5.5 eV² at the tested amplitudes or pushes $\\Delta m^2$ above 5.5 eV².","The source production scheme requires only about 70 days of irradiation in a fast-neutron reactor using 15 kg of natural nickel (or about 10 kg enriched), making the experiment feasible with existing reactor fluxes."],"supporting_citations":[{"why":"Supplies the BEST experiment procedures, statistics (~700 events per zone), extraction efficiency, and the previous gallium anomaly measurement (R = 0.80 ± 0.05) that BEST-2 extends.","marker":"[25]"},{"why":"Provides the BEST result and the covariance-matrix $\\chi^2$ method used to build the allowed-parameter regions for BEST-2.","marker":"[24]"},{"why":"Establishes the gallium anomaly (R = 0.87 ± 0.05) and the solar-neutrino background rate (about 1 capture per day per 50 t) used in the error estimates.","marker":"[12]"},{"why":"PROSPECT data supply the exclusion curve in Fig. 10 that almost completely covers the claimed sensitivity region, the main external constraint the experiment must survive.","marker":"[16]"},{"why":"T2K data exclude part of the parameter space and define an allowed region that BEST-2 could test.","marker":"[21]"},{"why":"Provides the $^{71}$Ga neutrino capture cross section at the cobalt neutrino energy ($253\\times 10^{-46}$ cm²) that sets the expected event rate.","marker":"[31]"},{"why":"The Neutrino-4 best-fit oscillation parameters ($\\Delta m^2 = 7.2$ eV², $\\sin^2 2\\theta = 0.36$) lie at the boundary of the 2σ sensitivity region, anchoring the comparison of reach.","marker":"[22]"},{"why":"IceCube evidence for sterile neutrino transitions supplies motivation and a parameter region ($\\Delta m^2$ from 2.4 to 9.6 eV²) partly overlapping the experiment's reach.","marker":"[23]"}],"fun_headline_variants":["Three-zone gallium experiment to map sterile neutrino oscillation curve","Concentric gallium zones around cobalt source to probe gallium anomaly","New gallium experiment could measure sterile neutrino parameters","Cobalt source with three gallium zones to test neutrino oscillations","Distance-resolved gallium experiment to pin down sterile mass"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The determination claim collapses if the true oscillation parameters lie outside the claimed sensitivity region or if the real outer-zone counting-rate uncertainties exceed the fixed 7% used to draw the sensitivity boundaries, because the paper asserts without a quantitative check that this simplification has virtually no effect.","fun_headline_variants_meta":{"raw":{"variants":["Three-zone gallium experiment to map sterile neutrino oscillation curve","Concentric gallium zones around cobalt source to probe gallium anomaly","New gallium experiment could measure sterile neutrino parameters","Cobalt source with three gallium zones to test neutrino oscillations","Distance-resolved gallium experiment to pin down sterile mass"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000857,"raw_usage":{"total_tokens":3685,"prompt_tokens":875,"completion_tokens":2810,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":491,"completion_tokens_details":{"reasoning_tokens":2727}},"tokens_in":491,"tokens_out":2810,"duration_ms":20395,"temperature":1.0,"reasoning_tokens":2727,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-10T20:29:35.643097+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Run BEST-2 as proposed and compare the three zone rates after the ten exposures: if every pairwise ratio deviation is below 1σ (D(l,k) < 7%), the predicted few-many-few oscillation pattern is absent; alternatively, a total capture rate that differs from the previous gallium-experiment average by more than 2σ would disprove sterile oscillations as the main cause of the gallium anomaly.","supporting_citations":[{"cited_title":"Aguilar-Arevalo, A.O","cited_arxiv_id":null,"evidence_quote":"Supplies the BEST experiment procedures, statistics (~700 events per zone), extraction efficiency, and the previous gallium anomaly measurement (R = 0.80 ± 0.05) that BEST-2 extends."},{"cited_title":"Aguilar, L.B","cited_arxiv_id":null,"evidence_quote":"Provides the BEST result and the covariance-matrix $\\chi^2$ method used to build the allowed-parameter regions for BEST-2."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Establishes the gallium anomaly (R = 0.87 ± 0.05) and the solar-neutrino background rate (about 1 capture per day per 50 t) used in the error estimates."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"PROSPECT data supply the exclusion curve in Fig. 10 that almost completely covers the claimed sensitivity region, the main external constraint the experiment must survive."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"T2K data exclude part of the parameter space and define an allowed region that BEST-2 could test."},{"cited_title":"Abdurashitov, V.N","cited_arxiv_id":null,"evidence_quote":"Provides the $^{71}$Ga neutrino capture cross section at the cobalt neutrino energy ($253\\times 10^{-46}$ cm²) that sets the expected event rate."},{"cited_title":"The main ones are heat release and radiation activity","cited_arxiv_id":null,"evidence_quote":"The Neutrino-4 best-fit oscillation parameters ($\\Delta m^2 = 7.2$ eV², $\\sin^2 2\\theta = 0.36$) lie at the boundary of the 2σ sensitivity region, anchoring the comparison of reach."},{"cited_title":"new physics","cited_arxiv_id":null,"evidence_quote":"IceCube evidence for sterile neutrino transitions supplies motivation and a parameter region ($\\Delta m^2$ from 2.4 to 9.6 eV²) partly overlapping the experiment's reach."}],"review_version":1}