1 会计学 AGASAResults阿嘉莎的结果 Physics motivation Understanding nature & origin of UHECRs (>1019eV) Energy spectrum Arrival direction distribution Chemical composition Super GZK particles incl. highest energy cosmic rays (>1020eV) Bottom-up scenarios AGNs / GRBs / Galactic clusters etc. ⇒ Hadronic primaries predicted Top-Down scenarios Topological defects Super heavy dark matter Z-burst ⇒ Gamma-ray + nucleon 1ries predicted Source location still not identified, …..but ….. pUHECR γCMB → N π+ (E0 ~5x1019eV) Arrival direction distribution (>4x1019eV; θ<50º) Small scale anisotropy Event clustering (>4x1019eV within º) 6 doublets (○) &1 triplet (○) observed Against expected doublets (Pch <0. 1%) There must be ~ 250 EHECR sources (185–340) Log E>
Space angle distribution of events Significant peak @ 0 degree implying presence of compact EHECR sources Log E>
Institute for Cosmic Ray Research, University of Tokyo (Kashiwa) Masaki Fukushima, Naoaki Hayashida, Hideyuki Ohoka, Satoko Osone, Makoto Sasaki, Masahiro Takeda, Reiko Torii Kinki University (Osaka) Michiyuki Chikawa University of Yamanashi (Kofu) Ken Honda, Norio Kawasumi, Itsuro Tsushima Saitama University (Saitama) Naoya Inoue Musashi Institute of Technology (Tokyo) Kenji Kadota Tokyo Institute of Technology (Tokyo) Fumio Kakimoto Nishina Memorial Fundation (Tokyo) Koichi Kamata Hirosaki University (Hirosaki) Setsuo Kawaguchi Osaka City University (Osaka) Saburo Kawakami RIKEN (Wako) Yoshiya Kawasaki, Naoto Sakaki, Hirohiko M. Shimizu Ehime University (Matsuyama) Satoko Mizobuchi, Hisashi Yoshi Fukuki University of Technology (Fukui) Motohiko Nagano Communication Research Laboratory (Tokyo) Masahiko Sasano National Institute of Radiological Sciences (Chiba) Yukio Uchihori Chiba University (Chiba) Nobuyuki Sakurai, Shigeru Yoshida Max-Planck-Institute for Physics (Munich) Kenji Shinozaki, M
