WEB Signal 365
Shutdown reactor's faint antineutrino glow measured for first time
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Researchers detected the residual antineutrino signal from a shutdown reactor for the first time, matching predictions of radioactive decay in the core and spent-fuel pools.
This opens a way to monitor reactor status and spent-fuel inventories even when reactors are offline. Antineutrino detectors could independently confirm shutdown and track fuel, aiding nuclear safeguards.
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Double Chooz detected about 100 antineutrino events over 17.2 days while both Chooz reactor units were shut down.
The measured signal matched simulations of decay from remaining fuel and spent-fuel pools.
The result provides a benchmark for studying residual antineutrino emission, with JUNO-TAO also exploring reactor-off data.
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