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KamLAND

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description KamLAND Overview

KamLAND, short for the Kamioka Liquid Scintillator Antineutrino Detector, is a large experimental facility located deep underground in the Kamioka Mine in Hida, Japan. It is designed to detect low-energy antineutrinos emitted by nuclear reactors operating across Japan. Beginning in 2002, the data collected by the observatory provided definitive evidence for neutrino oscillation. The experiment is also capable of detecting geoneutrinos, which has allowed scientists to better constrain the amount of radiogenic heat produced within the Earth.

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What does KamLAND detect?

KamLAND detects electron antineutrinos using a large volume of liquid scintillator viewed by photomultiplier tubes. Many of the antineutrinos in its landmark oscillation measurements originated from nuclear reactors across Japan.

How did KamLAND prove that neutrinos oscillate?

KamLAND observed fewer reactor antineutrinos than expected and measured an energy-dependent distortion consistent with oscillation. Its results complemented solar-neutrino experiments by testing the phenomenon with antineutrinos over terrestrial baselines.

Where is KamLAND located?

The detector is underground in the Kamioka mine in Gifu Prefecture, Japan. The rock overhead shields it from much of the cosmic-ray background that would interfere with rare-event measurements.

What are geoneutrinos, and how does KamLAND measure them?

Geoneutrinos are antineutrinos produced by radioactive decays inside Earth, particularly in uranium and thorium decay chains. KamLAND has detected them, helping researchers constrain how much terrestrial heat comes from radioactive decay.

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