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Scientists detect geoneutrinos by looking for the rare, paired signals made when an electron antineutrino from radioactive decay inside Earth interacts in a large underground detector. They then separate likely geoneutrino events from reactor antineutrinos and other backgrounds using statistical analysis and geological models. The detector does not photograph or directly sample the mantle: its measurements support an inference about Earth’s interior.
What are geoneutrinos?
Geoneutrinos are electron antineutrinos produced by radioactive decays inside Earth. The uranium-238 and thorium-232 decay chains are key sources; potassium-40 also contributes to the overall geoneutrino picture. Because these isotopes generate heat as they decay, measuring their antineutrinos can help scientists estimate how much heat-producing radioactivity Earth contains. The SNO+ Experiment describes the geoscience value this way: “These ‘geo-neutrinos’ are interesting from a geoscience point of view because they can tell us the amount of radioactivity present deep inside the Earth.”
Antineutrinos pass through matter readily, so almost all of those crossing a detector leave no trace. Experiments therefore need large targets, sensitive light detectors, extended observation, and methods for identifying a small number of genuine interactions among other events. The detection principles and experimental challenges are reviewed in Oleg Smirnov’s 2019 review.
How does an underground detector catch one?
It looks for inverse beta decay
In the established liquid-scintillator method, an electron antineutrino can interact with a proton in the detector’s target through inverse beta decay, producing a positron and a neutron. The positron deposits energy and annihilates, creating a prompt flash of scintillation light. The neutron is captured after a short delay, producing a second flash associated with the first. This prompt-and-delayed coincidence is the characteristic signature analysts seek. The reaction is also described in the 2026 JUNO geoneutrino prospects paper.
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It reduces noise before analysis
The paired signals make it less likely that an unrelated detector event will be mistaken for an antineutrino interaction, but they do not identify the antineutrino’s source by themselves. Experiments apply event-selection criteria and characterize remaining backgrounds. Placing a detector deep underground reduces the cosmic-ray muon flux and related background events. Low radioactive contamination in the detector and its surroundings is also essential; Borexino’s experiment overview identifies radiopurity as a central part of its low-background program. A 2024 review of Borexino discusses the experiment’s technical methods and scientific results: “Technological Novelties and Scientific Discoveries with the Borexino Experiment.”
How do scientists distinguish geoneutrinos from background events?
A candidate event’s timing and energy—or its measured light yield—cannot label it as a geoneutrino from Earth. The observed sample can include geoneutrinos, antineutrinos from nuclear reactors, accidental coincidences between unrelated events, and cosmogenic backgrounds associated with cosmic rays.
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Researchers select candidate events, estimate how the different signal and background sources should appear, and fit those expectations to the observed energy spectrum. In Borexino’s comprehensive analysis, the collaboration fitted 154 selected candidates. It constrained the principal accidental and cosmogenic backgrounds, while generally allowing the geoneutrino and reactor contributions to vary in the fit. The analysis and its methods are reported by the Borexino Collaboration.
How can the signal reveal anything about the mantle?
The detector records the combined signal reaching its site; it does not tag an event as coming from the crust or mantle. This matters because uranium and thorium in the nearby crust can make a substantial contribution to the observed geoneutrino signal. Scientists use estimates of crust composition and structure to account for the lithospheric contribution, then infer what remains from deeper sources.
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That inference depends on both detector data and geological models. In its 2020 analysis, Borexino reported that its knowledge of the local crust allowed it to reject the hypothesis of a zero mantle signal at 99.0% confidence. This confidence level belongs to that specific Borexino analysis; it is not a universal certainty level that applies to every experiment.
What have experiments measured, and what remains an inference?
Borexino’s comprehensive result used data collected from December 2007 to April 2019 and was published in January 2020. The collaboration reported a measured uranium-and-thorium geoneutrino signal of 47.0 TNU, with statistical and systematic uncertainties, and an inferred mantle signal of 21.2 TNU after accounting for the lithospheric contribution. Those are distinct quantities: the measured total signal is not itself a direct mantle measurement.
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From its analysis, Borexino inferred 24.6 TW of mantle radiogenic heat from uranium and thorium. Its estimated total Earth radiogenic heat was 38.2 TW under the stated assumptions, including the lithosphere contribution and an assumed mantle potassium fraction. These heat figures are model-dependent inferences, not direct readings from the detector. The standard inverse-beta channel does not detect the lower-energy antineutrinos from potassium-40, so the potassium contribution to the total-heat estimate had to be assumed rather than measured through this channel. The Borexino result gives the analysis and its qualifications.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do the experiments differ?
| Experiment | What the cited source establishes | How to interpret it |
|---|---|---|
| KamLAND, Japan | The SNO+ collaboration overview identifies KamLAND as reporting the first geoneutrino detection in 2005. SNO+ overview | A historical reported detection; the cited overview is not a comparison of current detector performance. |
| Borexino, Italy | The collaboration published a comprehensive geoneutrino analysis in January 2020 using data from December 2007 to April 2019. Borexino result | A measured signal and model-dependent mantle and heat inferences, as described above. |
| SNO+, Canada | The collaboration describes the regional geology as extensively characterized and its measurement as part of a global analysis with KamLAND and Borexino. SNO+ geoneutrino page | Its location provides a different geological context. The cited page does not by itself establish its present data-taking status. |
| JUNO, China | A 2026 prospects paper describes a 20-kiloton liquid-scintillator target and model-dependent predicted geoneutrino signal ranges. JUNO prospects paper | The target mass and signal ranges are presented in a forecast, not as a measured JUNO geoneutrino result. |
When comparing experiments, target mass and exposure are only part of the picture. Depth, reactor-antineutrino background, local crust composition and its uncertainty, radiopurity, event-selection performance, and energy resolution all affect the result. A larger detector can collect more statistics, but it cannot by itself remove uncertainty in the geological models needed to interpret the mantle contribution.
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