Cosmic Radiation Laboratory, Riken, 2-1, Hirosawa, Wako, 351-0198, Japan
Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Cosmic Radiation Laboratory, Riken, 2-1, Hirosawa, Wako, 351-0198, Japan
Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Department of High Energy Astrophysics, Institute of Space and Astronautical Science, JAXA, 3-1-1, Sagamihara, Kanagawa, 229-8501, Japan
Cosmic Radiation Laboratory, Riken, 2-1, Hirosawa, Wako, 351-0198, Japan
Cosmic Radiation Laboratory, Riken, 2-1, Hirosawa, Wako, 351-0198, Japan
Department of Physics, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
Cosmic Radiation Laboratory, Riken, 2-1, Hirosawa, Wako, 351-0198, Japan ; Department of High Energy Astrophysics, Institute of Space and Astronautical Science, JAXA, 3-1-1, Sagamihara, Kanagawa, 229-8501, Japan