Measurement of the Absolute Proton and Helium Flux at the Top of the Atmosphere using IMAX

W. Menn, M. Hof, O. Reimer, M. Simon, L.M. Barbier, E.R. Christian, K.E. Krombel, J.W. Mitchell, J.F. Ormes, R.E. Streitmatter, A.J. Davis, A.W. Labrador, R.A. Mewaldt, S.M. Schindler, R.L. Golden, S.J. Stochaj, W.R. Webber, Ib Lundgaard Rasmussen

    Research output: Contribution to journalJournal articleResearchpeer-review


    The balloon-borne experiment IMAX launched from Lynn Lake, Canada in 1992 has been used to measure the cosmic ray proton and helium spectra from 0.2 GV to approximately 100 GV. The IMAX apparatus was designed to search for antiprotons and light isotopes using a superconducting magnet spectrometer with ancillary scintillators, time-of-flight, and aerogel cherenkov detectors. High resolution drift chambers and MWPCs were used as the tracking devices. Using redundant detectors, an extensive examination of the instrument efficiency was carried out. We present the absolute spectra of protons and helium corrected to the top of the atmosphere. The IMAX experiment was supported by NASA: RTOP 353-87-02 (GSFC), grants NAGW-1919 (Caltech) and NAGW-1418 (NMSU), and in Germany by the DFG and the BMFT. ^1 present address Max-Planck-Institut für Extraterrestrische Physik
    Original languageEnglish
    JournalAmerican Physical Society Meeting Abstracts
    Pages (from-to)K1011
    Publication statusPublished - 1996


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