Photon and Helium Energy Spectra above 1 TeV for Primary Cosmic Rays

Abstract

Energy spectra of protons and helium nuclei in the primary cosmic rays were measured above 1 TeV in a series of balloon flights of emulsion chambers. Differential spectra may be represented by power laws of indices -2.81\ifmmode\pm\else\textpm\fi{}0.13 and -2.83\ifmmode\pm\else\textpm\fi{}0.20 for protons and He, respectively. No index change was observed for either species over the energy ranges 5-500 TeV for protons and 2-50 TeV/nucleon for He. Intensities were consistent with extrapolations of previously published data below 1 TeV/nucleon.