The chlorine-argon neutrino detectors, like the one used by Davis, detect only neutrinos from a low-yield side branch of the main nuclear reaction in the Sun. Galium-germanium neutrino detectors were developed to detect neutrinos from the main nuclear reaction itself. When these detectors were used it was found that the:

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The galium-germanium neutrino detectors were developed to detect neutrinos from the main nuclear reaction in the Sun, which was expected to produce a much higher neutrino flux than the low-yield side branch detected by chlorine-argon detectors. However, when these detectors were used, it was found that the neutrino flux was still too low. This discrepancy between the predicted and measured neutrino flux is known as the "solar neutrino problem."

The Chlorine-Argon Neutrino Detectors, Like the One Used by Davis