About the Cover
Vol. 80 No. 1 (2004)
Inside of Super-Kamiokande (Kamioka Observatory, ICRR (Institute for Cosmic Ray Research), The University of Tokyo)
Water half filled and a rubber boat checking the photomultipliers.
The total number of PMT (photomultiplier tubes)’s is more than 11,000.
This detector was built to serve as the astrophysical observatory of the solar neutrinos. It also produced the precise result on the neutrino finite masses.
Written by Masatoshi Koshiba, M. J. A.