2006/11/30 by Y. Shikaze, S. Haino, K. Abe +23 · 3 citations
Medicine · Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Atmosphere (unit) #Atomic physics #Cosmic ray #Dark Matter and Cosmic Phenomena #Helium #Meteorology #Nuclear physics #Optics #Physics #Proton #Radiation Therapy and Dosimetry #Range (aeronautics) #Spectral line #Spectrometer #astro-ph
paper · pdf · doi:10.1016/j.astropartphys.2007.05.001
published as Astropart.Phys.28:154-167,2007 · 27 pages, 7 Tables, 9 figures, Submitted to Astroparticle Physics
arxiv created 2007/04/21 · openalex publication_date 2007/05/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 observations were carried out with the BESS spectrometer launched on a balloon at Lynn Lake, Canada. A calculation for the correction of secondary particle backgrounds from the overlying atmosphere was improved by using the measured spectra at small atmospheric depths ranging from 5 through 37 g/cm2. The uncertainties including statistical and systematic errors of the obtained spectra at the top of atmosphere are 5-7 % for protons and 6-9 % for helium nuclei in the energy range 0.5 - 5 GeV/n.