Primary Proton and Helium Spectra Observed by RUNJOB Collaboration

Details Primary Proton and Helium Spectra Observed by RUNJOB Collaboration Primary Proton and Helium Spectra Observed by RUNJOB Collaboration

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.1837f&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

5

Scientific paper

From 1995 through 1999, RUssian Nipp on JOint Balloon collab oration (RUNJOB) had 10 successful balloon flights to observe primary cosmic rays by emulsion chambers. We have reported the half of the total exposure, 575 m2 hour and in this paper we will report the spectra of protons and alpha particles, using all the data with sum of gamma ray energies greater than 5 TeV, though some chambers are scanned for the lower energy events. And we have got the spectra up to 1015 eV/nucleon. We also report the technical details for the energy determination method newly employed, basing on the lateral spread of cascade showers.

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