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  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR  (3)
  • GEOPHYSICS  (1)
  • 1
    Publication Date: 2019-06-27
    Description: Determination of the mean interaction lengths for 9.3-, 13.8-, and 17.8-GeV protons and 9.3- and 17.8-GeV positive pions in iron. The mean interaction length of pions is found to be approximately 20% greater than that of protons. No statistically significant variation of the mean interaction length for protons or pions as a function of energy is observed. With only two exceptions, the data obtained show a systematic 5% difference between measurements of the mean interaction length made with cosmic rays and those made with accelerator-produced protons.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 7
    Format: text
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  • 2
    Publication Date: 2019-06-27
    Description: The interaction lengths of pions and protons in iron have been measured using an ionization spectrometer composed of alternating layers of iron and plastic scintillator. These measurements cover an energy range from 9.3 to 18 GeV. The interaction lengths were determined by accurate statistical analyses of the experimental data using the maximum likelihood method. The dependence of the interaction length on the parameters used to define an interaction was studied, and the results reported employ parameters chosen to minimize the percentage uncertainty in the interaction length. The mean interaction length of pions was found to be approximately 20% greater than that of protons.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-65951 , X-661-72-194
    Format: application/pdf
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  • 3
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    In:  Other Sources
    Publication Date: 2019-07-27
    Description: The flux of albedo antiprotons in the 100-1000 MeV kinetic energy range produced by the cosmic ray primaries in the atmosphere is calculated. It is shown that this is not a significant background to measurements of the low energy anti-proton cosmic ray flux.
    Keywords: GEOPHYSICS
    Type: AIP Conference on Cosmic Abundances of Matter; Sept. 7-9, 1988; Minneapolis, MN; United States
    Format: text
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  • 4
    Publication Date: 2019-06-27
    Description: Charge and energy spectra of primary cosmic rays made with large area Cerenkov scintillation counter on baloon flights - heavier than iron nuclei
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-83419 , CR-92
    Format: application/pdf
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