PMT size shows charge (amount of light), color shows time of flight (from the reconstructed vertex) subtracted (residual) time. A time of flight cut (600 ns wide, the histogram range) was performed to remove PMTs that were hit too early or too late. The histogram at the bottom (above a base line shown for color scale) shows charge as a function of residual time (600 ns span, extreme bins are overflow bins).
Two peaks are seen in the histogram: one for the main two rings (rings visible in blue, in center (91 MeV) and right (72 MeV), shown with projected reconstructed Cherenkov cone outlines, on detector side wall), and another for electron from muon decay, 370 ns later (fuzzy ring visible in yellow, in center left, overlapping about 50% of the center ring, partially on detector top wall and mostly on detector side wall, without Cherenkov cone outline shown).
"X" marks show reconstructed vertex projections on walls. Diamonds mark projected reconstructed track exit points, and plus signs mark back projected track entry points.
This event was recorded on 1996/05/29 21:23:05 (run 1734 subrun 6 event 38449).
The histogram at the bottom (above a base line for color scale) shows charge as a function of raw time (120 ns span). The extreme bins are overflow bins and their value may be truncated. PMTs that were not hit are dark grey.
"X" marks show reconstructed vertex projections on walls. Diamond shows projected reconstructed exit. Outline shows projected reconstructed Cherenkov cone. Inner outline shows where the cone would end if the particle exited.
Reconstructed muon momentum is 2112 MeV.
Recorded on 1996/06/09 00:16:29 (run 1938 subrun 21 event 126149).
Histogram at the bottom (above a base line shown for color scale) shows number of hits as a function of charge (from 0 to 13 pe (photo-electrons)). The last bin is an overflow bin.
X marks show reconstructed vertex projections on walls. Diamonds mark projected reconstructed track exit points. At the vertex, 2 m long lines are drawn in 3D space in direction of each track (visible above the right ring).
Left ring was reconstructed at 1492 MeV, right at 64 MeV.
This event was recorded on 1996/06/21 14:08:00 (run 1944 subrun 78 event 474301).
The left image is meant for the right eye and the right image for the left eye. Distance between eyes was set to 1 m. To view this event one should cross the eyes. Don't put the image too close. Put your finger tip between the picture and your eyes, close to your eyes. Look at the tip. Put it at such distance that the background SK image blends into 3 images, the middle one is the stereo image. It is blurred as long as you focus on your finger. Now the most difficult part. Try to focus on the SK image without uncrossing your eyes. It may take a few minutes to learn to do it.
How these images were made
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