Scientists detect a nuclear reactor’s ghostly afterglow for the first time
Nuclear reactors may go dark, but their fuel continues producing a faint antineutrino “glow” long after shutdown. Researchers have now detected that residual signal for the first time, finding it closely matched predictions of radioactive decay inside the reactor and nearby spent-fuel pools. The breakthrough suggests antineutrino detectors could eventually monitor reactors even when they are…
Even after a nuclear reactor is shut down, radioactive particles called antineutrinos continue to emit a weak stream of particles for months or years. Scientists at the Double Chooz collaboration have succeeded in detecting these ghostly antineutrino emissions for the first time from a shut-down reactor. This measurement was conducted at the Chooz nuclear power plant in northern France, where the Double Chooz detector, situated underground 400 meters from the facility, observed around 100 antineutrino candidate events over 17.2 days of operation while both reactor units were fully shut down.
The detection of antineutrinos from the reactor provided the first direct experimental confirmation of predictions describing antineutrino emissions from shut-down reactors and spent fuel. This breakthrough opens up new possibilities for reactor monitoring, nuclear safety, and safeguards. The measurement was made possible by the highly sensitive antineutrino detector, which can gather information about nuclear reactors even while they are shut down.
The findings suggest that antineutrino detectors could eventually provide useful information about nuclear reactors during maintenance and after shutdown, potentially becoming valuable for independently confirming reactor status and tracking spent-fuel inventories.
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