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The vertical absolute fluxes of atmospheric muons and muon charge ratio have been measured precisely at different geomagnetic locations by using the BESS spectrometer. The observations had been performed at sea level (30 m above sea level) in Tsukuba, Japan, and at 360 m above sea level in Lynn Lake, Canada. The vertical cutoff rigidities in Tsukuba (36.2 o N, 140.1 o E) and in Lynn...
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...
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