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We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of theBESS spectrometer in 1998. The magnetic-rigidity of the cosmic-rays wasreliably determined by highly precise measurement of the circular track in auniform solenoidal magnetic field of 1 Tesla. Those spectra were determinedwithin overall uncertainties of +-5 0.000000or protons and +- 10 0.000000or helium nucleiincluding statistical and systematic errors.
Sanuki et al. (Wed,) studied this question.
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