Final answer:
Neutrino detectors have poor angular resolution because neutrinos weakly interact with matter, making them difficult to detect. Neutrino oscillations and their potential role in dark matter are key areas of study in understanding these particles.
Step-by-step explanation:
Neutrino detectors typically have poor angular resolution due to the very weak interaction of neutrinos with matter. The tiny interaction cross-section of neutrinos means they rarely interact with the detectors, which are designed to capture the fleeting signs of neutrino interactions. Neutrino oscillations, a phenomenon where neutrinos change from one flavor to another over distances or time, is one explanation for the lower than expected number of observed solar neutrinos. These oscillations may also account for discrepancies in the number of neutrinos observed from cosmic ray showers, which, interestingly, suggest an equal number of muon neutrinos (νμ) and electron neutrinos (νε) despite predictions to the contrary.
Massive neutrinos are considered a potential component of dark matter due to their small, but non-zero mass, and their weak interaction with other matter makes them elusive particles that only large and sophisticated detectors, such as those using heavy water and arrays of photomultiplier tubes, can occasionally capture.