Fig. 7.
Types of events observed in atmospheric neutrino experiments. Events whose vertex positions are located inside the fiducial volume of the detector and all visible secondary particles stop in the detector are called “fully-contained (FC)” events (left panel). νμ events with the multi-GeV neutrino energies produce energetic muons which do not stop in the detector. They are called “partially-contained (PC)” events (second panel from the left). High energy νμ interactions in the rock below the detector produce high energy muons. These muons enter into the detector. Some of them stop in the detector (upward stopping muons, second panel from the right) or penetrate through the detector (upward through-going muons, right panel).