Precise Measurement of Cosmic‐Ray Proton and Helium Spectra with the BESS Spectrometer
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Open Access
- 20 December 2000
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 545 (2) , 1135-1142
- https://doi.org/10.1086/317873
Abstract
We report cosmic-ray proton and helium spectra in energy ranges of 1-120 GeV nucleon-1 and 1-54 GeV nucleon-1, respectively, measured by a flight of the Balloon-borne Experiment with Superconducting Spectrometer (BESS) in 1998. The magnetic rigidity of the cosmic ray was reliably determined by highly precise measurement of the circular track in a uniform solenoidal magnetic field of 1 T. Those spectra were determined within overall uncertainties of ±5% for protons and ±10% for helium nuclei including statistical and systematic errors.Keywords
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