Cosmic-Ray Proton and Helium Spectra above 50 GeV
- 10 April 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 28 (15), 985-988
- https://doi.org/10.1103/physrevlett.28.985
Abstract
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.Keywords
This publication has 3 references indexed in Scilit:
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- A comparison of the energy spectra of cosmic ray helium and heavy nucleiAstrophysics and Space Science, 1969
- Energy spectra of nuclear-active particles at mountain altitudesCanadian Journal of Physics, 1968