On the propagation of cosmic rays in the Galaxy

Ormes, J. F.; Freier, P. S.

doi:10.1086/156160

Cited by 57 publications

(26 citation statements)

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“…Using models of propagation of cosmic rays in the interstellar medium, composition of cosmic rays in their source regions were deduced (Shapiro, et al, 1975). The leaky box model for the propagation of cosmic rays based on the available experimental results on composition of cosmic rays up to 100GeV/nucleon (Ormes and Freier, 1978) appeared to be consistent with the results in a general way. The available precision in the experimental results of C, O, and Fe spectra could, however, not rule out the possibility of some energy dependent source composition of cosmic rays.…”

Section: Introductionsupporting

confidence: 76%

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Cosmic ray studies with a gas Cherenkov counter in association with an ionization spectrometer

Balasubrahmanyan

Ormes

Arens

et al. 1980

Astrophys Space Sci

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The results from a balloon borne gas Cherenkov counter (threshold 16.5 GeV/ nucleon) and an ionization spectrometer are presented. The gas Cherenkov counter provides an absolute energy calibration for the response of the calorimeter for 5 < Z < 26 nuclei of cosmic rays. The contribution of scintillation to the gas Cherenkov pulse height has been obtained by independently selecting particles below the gas Cherenkov threshold using the ionization spectrometer. Energy spectra were derived by minimizing the X'" between a Monte Carlo simulated data and flight data. Best fit power laws (dN/dE = AE-1 ) were determined for C, N, O, Ne, Mg, and Si. The power laws, all consistent with E-2.7 , are not good fits to the data.A better fit is obtained using the spectrum derived from the spectrometer. The data from the ionization calorimeter (Simon, et al., 1980) and the gas Cherenkov are thus completely self-consistent.

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Section: Introductionsupporting

confidence: 76%

“…For these nuclei, slowly steepening energy spectra are expected due to increasing importance of escape relative to nuclear interactions as energy increases (see discussion in Ormes and Freier, 1978). The observed steepening is consistent with such an effect.…”

Section: Resultssupporting

confidence: 53%

Cosmic ray studies with a gas Cherenkov counter in association with an ionization spectrometer

Balasubrahmanyan

Ormes

Arens

et al. 1980

Astrophys Space Sci

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“…As noted earlier, the previous interpretation of the observed energy spectra ( Ormes and Freier, 1978) …”

Section: Injection Spectrasupporting

confidence: 62%

Interpretation of Cosmic Ray Composition: The Pathlength Distribution

Protheroe

Ormes

Comstock³

1981

Origin of Cosmic Rays

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“…Using the observed relative abundance of the light secondary elements Be and B and the primary elements C and 0, we can determine a mean escape length X e (E) as a function of energy. The general featu •es found by Ormes and Freier (1978) are present: a decreasing escape length at high energies (> 2 GeV/nuc), and a constant escape…”

Section: Of Poor Qualitymentioning

confidence: 85%