Is a fast acting high efficiency neutrino detector possible?

Question

Todays detectors rely on rare interactions (with matter), which makes them large and slow. Is anything much better even possible?

Answer 1

No, the rate at which neutrinos interact with baryonic matter is determined by its coupling strength with the weak nuclear force, which is a physical constant. As such, the only way for a neutrino detector to increase the amount of interactions it detects is to increase the volume, thus increasing the amount of opportunities for neutrinos to interact with matter.