Affiliation: | a Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan b Department of Physics, Nagoya University, Nagoya 464, Japan c Department of Physics, Saitama University, Saitama 338, Japan d Department of Physics, Fujita Gakuen Health University, Aichi 470-11, Japan e Department of Physics, Kinki University, Osaka 577, Japan f Department of Physics, Osaka City University, Osaka 558, Japan g College of Liberal Arts, Kobe University, Kobe 657, Japan h Department of Physics, Aichi Shukutoku University, Aichi-Gun, Nagakute 480-11, Japan |