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The energy spectrum of cosmic-ray antiprotons ( p ̄'s) has been measured by BESS successively in 1993, 1995, 1997 and 1998. In total, 848 p ̄'s were clearly identified in energy range 0.18–4.20 GeV. From these successive measurements of the p ̄ spectrum at various solar activity, we discuss about the effect of the solar modulation and the origin of cosmic-ray p ̄'s. The p ̄/p ratios showed no...
A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of the BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95% C.L.) on the antihelium flux of 6x10 -4 m -2 sr -1 s -1 at the top of the atmosphere in the rigidity region...
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