Observation of cosmic-ray antiprotons at energies below 500 MeV.

K. Yoshimura, ' S. Orito, ' I. Ueda, ' K. Anraku, R. Golden, M. Imori, ' S. Inaba, B. Kimbell, N. Kimura, Y. Makida, H. Matsumoto, H. Matsunaga, ' J. Mitchell, M. Motoki, J. Nishimura, M. Nozaki, J. Ormes, T. Saeki, ' R. Streitmatter s J Suzuki, K. Tanaka, N. Yajima, T. Yamagami, A. Yamamoto, and T. Yoshida' 'University of Tokyo, Bunkyo ku, T-okyo, 113, Japan 2National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki, Japan New Mexico State University, I as Cruces, New Mexico 88003 Kobe University, Kobe, Hyogo, Japan ~National Aeronautics and Space Administration, Goddard Space Flight Center (NASA/GSFC), Greenbelt, Maryland 2077I 6The Institute of Space and Astronautical Science (ISAS), Sagamihara, Kanagavva, 229, Japan (Received 20 March 1995)