- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota, U.S.A.
A dE/dx-E scintillation counter device was flown at absolute solar minimum, in terms of particle influx, on 12 May, 1965 from Barrow, Alaska. Due to the resolution characteristics of the instrument, isotopic separation of hydrogen and helium nuclei in the cosmic radiation was possible. Twenty-six hours of data obtained in the atmospheric depth interval from 3·5 to 5 g/cm2 are analyzed to determine the energy spectrum of primary galactic protons in the primary energy interval 70–150 MeV, an upper limit on the primary deuteron flux in the interval 45–60 MeV/nucleon, the spectrum of primary He3 nuclei in the energy interval 90–150 MeV/nucleon, and the spectrum of primary He4 nuclei in the energy interval 80–120 MeV/nucleon. The ratio of He3 nuclei to total helium nuclei at the same energy/nucleon was found to be 0·11 ± 0.5 at 100 MeV/nucleon.
- 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
- 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie ; 4 - biophysique des tissus, organes et organismes
- 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Space and Planetary Science
- 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics