Author/Authors :
BESS Collaboration، نويسنده , , A. Yamamoto، نويسنده , , K. Abe، نويسنده , , K. Anraku، نويسنده , , Y. Asaoka، نويسنده , , M. Fujikawa، نويسنده , , H. Fuke، نويسنده , , S. Haino، نويسنده , , M. Imori، نويسنده , , K. Izumi، نويسنده , , T. Maeno، نويسنده , , Y. Makida، نويسنده , , N. Matsui ، نويسنده , , H. Matsumoto، نويسنده , , H. Matsunaga، نويسنده , , F.B. McDonald، نويسنده , , J. Mitchell، نويسنده , , T. Mitsui، نويسنده , , S. A. Moiseev and V. G. Nikiforov ، نويسنده , , M. Motoki، نويسنده , , et al.، نويسنده ,
Abstract :
The Balloon-borne Experiment with a Superconducting Spectrometer, BESS, aims to study elementary particle/antiparticle phenomena in the early history of the Universe. The instrument has a unique feature of a thin superconducting solenoid magnet enabling a large geometrical acceptance with a horizontally cylindrical configuration. Seven balloon flights have been successfully carried out since 1993. More than 103 comic-ray antiproton have been unambiguously detected, and the energy spectrum has been measured with the characteristic peak at 2 GeV. The search for cosmic-ray antihelium brought the upper-limit of the antihelium/helium ratio down to < 10−6. To extend the highly sensitive measurements, we are planning polar long duration flights in Antarctica focusing on the very low energy antiproton spectrum towards the solar-minimum in the next decade.
