Cosmic-Ray Proton and Helium Spectra above 50 GeV

Details Cosmic-Ray Proton and Helium Spectra above 50 GeV Cosmic-Ray Proton and Helium Spectra above 50 GeV

Apr 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972phrvl..28..985r&link_type=abstract

Physical Review Letters, vol. 28, Issue 15, pp. 985-988

Physics

197

Scientific paper

Differential energy spectra of cosmic-ray protons and He nuclei have been measured for the first time by an ionization spectrometer flown at balloon altitudes. The energy range extended from 50 to > 1000 GeV. The observed differential intensities can be represented with power-law spectra with a slope of -2.75 +/- 0.03 for protons and of -2.77 +/- 0.05 for He nuclei. The proton-to-He ratio is 26 +/- 3 at 40 GeV/nucleon and is constant within errors up to 400 GeV/nucleon.

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