What was the basic detection principle of the Homestake solar-neutrino experiment?

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Observing the scintillation light produced by neutrino–electron elastic scattering.

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Measuring the activity of radioactive argon atoms produced by neutrino capture on chlorine nuclei.

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Detecting the Cherenkov radiation produced directly by neutrinos travelling through water.

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I do not answer.

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Measuring the neutron emission following antineutrino capture by free protons.

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