1. Department of Earth and Space Science, Graduate School of Science, Osaka University , 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
2. Interdisciplinary Theoretical & Mathematical Science Program (iTHEMS) , RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3. Kavli Institute for the Physics and Mathematics of the Universe (WPI) , UTIAS, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan
4. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Shijingshan, 100049 Beijing, China
5. Tianfu Cosmic Ray Research Center , No. 1500, Kezhi Road, Xinglong Street, Shuangliu, Chengdu, Sichuan 610213, China
6. Institute for Cosmic Ray Research, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan