Why must neutrino detectors be gigantic and built deep underground or underwater?

Answer

To compensate for the extremely rare probability of interaction.

Due to their extremely weak interaction, detectors must be massive and shielded, often kilometres underground or deep underwater, to filter out interfering cosmic rays and maximize the chance of capturing a rare interaction event.

Why must neutrino detectors be gigantic and built deep underground or underwater?

#Videos

What is the role of neutrinos in stellar energy? - YouTube

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