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Measurements of 0.2 to 20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer
Y. Shikaze, S. Haino, K. Abe +21
We measured low energy cosmic-ray proton and helium spectra in the kinetic energy range 0.215 - 21.5 GeV/n at different solar activities during a period from 1997 to 2002. The obse…
Measurements of Atmospheric Antiprotons
K. Yamato, K. Abe, H. Fuke +21
We measured atmospheric antiproton spectra in the energy range 0.2 to 3.4 GeV, at sea level and at balloon altitude in the atmospheric depth range 4.5 to 26 g/cm^2. The observed en…
Search for Cosmic-Ray Antideuterons
H. Fuke, T. Maeno, K. Abe +23
We performed a search for cosmic-ray antideuterons using data collected during four BESS balloon flights from 1997 to 2000. No candidate was found. We derived, for the first time,…
Measurement of Cosmic-Ray Proton and Antiproton Spectra at Mountain Altitude
T. Sanuki, M. Fujikawa, H. Matsunaga +22
Cosmic-ray proton and antiproton spectra were measured at mountain altitude, 2770 m above sea level. We observed more than 2 x 10^5 protons and 10^2 antiprotons in a kinetic energy…
Precise Measurement of Cosmic-Ray Proton and Helium Spectra with the BESS Spectrometer
T. Sanuki, M. Motoki, H. Matsumoto +31
We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of the BESS spectrometer in 1998…
Precision Measurement of Cosmic-Ray Antiproton Spectrum
S. Orito, T. Maeno, H. Matsunaga +31
The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.18 to 3.56 GeV, based on 458 antiprotons collected by BESS in recent solar-minimum period. We have de…
Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum
H. Matsunaga, S. Orito, H. Matsumoto +21
The absolute fluxes of the cosmic-ray antiprotons at solar minimum are measured in the energy range 0.18 to 1.4 GeV, based on 43 events unambiguously detected in BESS '95 data. The…
A New Limit on the Flux of Cosmic Antihelium
T. Saeki, K. Anraku, S. Orito +21
A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of BESS magnetic rigidity spectrometer. We have not observed any a…